Ncert Solutions Of Electricity Class 10th Video
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Question 1: On what factors does the resistance of a conductor depend Answer: Resistance of Ncert Solutions Of Electricity Class 10th Video a conductor depends upon: i Resistivity of the material. Question 2: Will current flow more easily through a thick wire or thin wire of the same material when connected to the same source? Question 3: Let the resistance of an electrical component remains constant while the potential difference across the two ends of the component Ncert Solutions Of Electricity Class 10th Video Ncert Solutions Of Electricity Class 10th Video decreases to half of its former value.
Answer: Hence, the current through an electrical component also becomes half of its previous value. Question 4: Why are the Ncert Solutions Of Electricity Class 10th Video coils of electric toasters and electric irons made of an alloy rather than a pure metal Answer: The coils of electric toaster and electric iron are made of an alloy rather than a pure metal because of the following reasons; i The resistivity of an alloy is higher than that of a pure metal.Ncert Solutions Of Electricity Class 10th Video
Question 5: Use the data in Table Question 2: Redraw the circuit of the above question, putting in an ammeter to measure the current through the resistors and a voltmeter to measure the voltage across the 12 resistor. What would be the reading in the ammeter and the voltmeter? Question 1: Judge the equivalent resistance when the following are connected in parallel.
What is the resistance of an electric iron connected to the same source that takes as much current as all Ncert Solutions Of Electricity Class 10th Video three appliances and what is the current flows through it? Question 3: What are the advantages of connecting electrical devices in parallel with the battery instead of Ncert Solutions Of Electricity Class 10th Video Ncert Solutions Of Electricity Class 10th Video connecting them in series? Answer: Advantages of connecting electrical devices in parallel:. Answer: a The highest resistance is secured by combining all four coils of resistance in series.
Question 1: Why does the cord of an electric heater not glow while the heating element does? Answer: The cord of an electric heater is made up of metallic wire such as copper or aluminum which has low resistance while the heating element is made up of an alloy which has more resistance than its constituent metals.
Question 2: Compute the heat generated while transferring C of charge in one hour through a potential difference of 50 V. Question 3: An Ncert Solutions Of Electricity Class 10th Video electric iron of resistance 20 Q takes a current of 5 A. Question 1: What determines the rate at which energy is delivered by a current?
Answer: Ncert Solutions Of Electricity Class 10th Video Ncert Solutions Of Electricity Class 10th Video Electric power determines the rate at which energy is delivered by a current. Question 2: An electric motor takes 5 A from a V line.
Question 1: A piece of wire of resistance R is cut into five equal parts. Question 2: Which of the following terms does not represent electrical power in a Ncert Solutions Of Electricity Class 10th Video circuit? Question 3: An electric bulb is rated V and W. Question 4: Two conducting wires of same material and of equal lengths and diameters are first connected Ncert Solutions Of Electricity Class 10th Video Ncert Solutions Of Electricity Class 10th Video Ncert Solutions Of Electricity Class 10th Video in series and then parallel in a circuit across the same potential difference.
The ratio of heat produced in series and parallel combinations would be a b Ncert Solutions Of Electricity Class 10th Video Ncert Solutions Of Electricity Class 10th Video c d Answer:. Question 5: How is a voltmeter connected in the circuit to measure the potential difference between two points? Question 6: A copper wire has Class Solutions Of Electricity Ncert Video 10th a diameter 0. Question 7: The values of the current I flowing in a given resistor for the corresponding values of potential difference V across the resistor Ncert Solutions Of Electricity Class 10th Video Electricity Class Solutions Ncert Of Video 10th Ncert Solutions Of Electricity Class 10th Video are given below: Plot a graph between V and I and calculate the resistance of that resistor.
Question 8: When a 12 V battery is connected across an unknown resistor, there is a current of 2. Question 9: A battery of 9 V is connected in series with resistors of 0. Answer: Since all the Ncert Solutions Of Electricity Class 10th Video resistors are in series, the same current, 0. Question Several electric bulbs designed to be used on a V electric supply line, are rated 10 W. Question Ncert Solutions Of Electricity Class 10th Video A hot plate of an electric oven connected to V line has two resistance coils A and B, each of 24 Q resistance, which may be used separately, in series, or in parallel.
Question Two lamps, one rated W at V, and the other 60 W at V, are connected in parallel to electric Ncert Solutions Of Electricity Class 10th Video mains supply. Question An electric heater of resistance 8 f2 draws 15 A from the service mains 2 hours. Question Explain the following. Answer: a It has high melting point and emits light at a high temperature. Each of them dissipates energy and can withstand a maximum power of 18 W without melting.
Find the Ncert 10th Of Video Class Electricity Solutions maximum current that can flow through the three resistors. Question 2: Should the resistance of an ammeter be low or high? Give reason. Answer: The resistance of an ammeter should be low so that it will not disturb the magnitude of current flowing through the circuit when connected in series in a circuit.
Question 3: How does use of a fuse wire protect electrical appliances? Answer: The fuse wire is always connected in series with the live wire or electrical devices. If Ncert Solutions Of Electricity Class 10th Video the flow of current exceeds the specified preset value due to some reason, the heat produced melts it and disconnects the circuit or the device from the mains. In this way, fuse wire protects the electrical appliances. Question 4: What is electrical resistivity? In a series electrical circuit comprising a resistor made up of a metallic wire, the ammeter reads 5 A.
The reading of the ammeter decreases to half when the length of the wire is doubled. Answer: The resistance offered by a metallic wire of unit length and unit cross-sectional area is called electrical resistivity.
Hence, when the length of wire is doubled, the resistance becomes Ncert Solutions Of Electricity Class 10th Video double and current decreases to half. Calculate the resistance of the electric lamp.
Question 6: Why is parallel arrangement used in domestic wiring? Answer: Parallel arrangement is Ncert Solutions Of Electricity Class 10th Video used in domestic wiring because i Each appliance gets the same voltage as that of the mains supply.
Question 7: B 1, B 2 and B 3 are three identical bulbs connected as shown in figure. When all the three bulbs glow, a current of 3A is recorded by the ammeter A. Answer: i Since Ncert Solutions Of Electricity Class 10th Video Video Electricity Class Ncert Solutions Of 10th B 1 ,B 2 and B 3 are in parallel, the potential difference across each of them will remain same.
So when the bulb B 1 gets fused, B 2 and B 3 have the same potential and continues with the same energy dissipated per second, i. Question 1: Three incandescent bulbs of W Ncert Solutions Of Electricity Class 10th Video each are connected in series in an electric circuit. In another circuit, another set of three bulbs of the same wattage are connected in parallel to the Ncert Solutions Of Electricity Class 10th Video Electricity Solutions Video Of Class Ncert 10th same source. Justify your answer. Will the rest of the bulbs continue to glow in each circuit?
Answer: a The bulbs in the two circuits will not Ncert Solutions Of Electricity Class 10th Video glow equally bright as the current through them is not the same. While the rest of bulbs in parallel circuit will continue to glow without getting disturbed because Ncert Solutions Of Electricity Class 10th Video in parallel combination, current gets additional paths to flow. Question 2: Find out the following in the electric circuit given in figure: Answer: e No difference, since the ammeters are connected in series and same current will pass through them, so reading of both ammeters will be same.
Question 1. To determine the equivalent Ncert Solutions Of Electricity Class 10th Video Ncert Solutions Of Electricity Class 10th Video Ncert Solutions Of Electricity Class 10th Video resistance of two resistors when connected in series, a student arranged the circuit components as shown in the diagram. But he did not succeed to achieve the objective. Question 2. For the given circuit, name the components which are connected in parallel.
Because terminals of the resistance and voltmeter are connected together. Question 3. A Video Of 10th Ncert Solutions Class Electricity student arranges the following circuit to get equivalent resistance of a series combination of two resistors R 1 and R 2. Which one of the following statements will be true for this circuit [CCE ] a It gives incorrect reading for current I as well as potential difference V b It gives correct reading 10th Solutions Electricity Video Class Of Ncert for current I but incorrect reading for potential difference V c It gives correct reading for potential difference V but incorrect reading for current I d It Ncert Solutions Of Electricity Class 10th Video gives correct reading for both I and V Answer: b The voltmeter should be connected across the components of and R 2 to give correct reading for Electricity Video Of 10th Ncert Class Solutions potential difference.
Question 4. An ammeter has 20 divisions between 0 mark and 2A mark on its scale. The least count of ammeter is a 0. Question 5. A closed and continuous path of electric devices, switching devices, source of electricity atc. The current flowing through a conductor is said to be 1A, if a charge of 1 coulomb C flows through it in 1 second s.
Name a device that helps to maintain a potential difference across a conductor. Electric cell or A battery is a device that helps to maintain a potential difference across a conductor. What is meant by saying that the potential difference between two Ncert Solutions Of Electricity Class 10th Video points is 1V?
The potential difference between two points is said to be 1 volt if 1 joule of work is done in moving 1 coulomb of Ncert Solutions Of Electricity Class 10th Video electric charge from one point to the other. How much energy is given to each coulomb of charge passing through a 6 V battery? Will current flow Ncert Solutions Of Electricity Class 10th Video Ncert Solutions Of Electricity Class 10th Video more easily through a thick wire or thin wire of the same material, when connected to the same source? Let the resistance of an electrical component remains constant while the potential difference across the two ends of the component decreases to half of its former value.
What change will occur in the current through it? Why Ncert Solutions Of Electricity Class 10th Video are the coils of electric toasters and electric irons made of an alloy rather than a pure metal? The coils of electric toaster and electric iron are made of an alloy rather than a pure metal because of the following reasons:. Redraw the circuit of the above question, putting in an ammeter to measure the current through the resistors and a voltmeter to measure the voltage across the 12 resistor.
What would be the reading in the ammeter and the Ncert Solutions Of Electricity Class 10th Video voltmeter? Since all the three resistors are connected in series, so, the equivalent resistance R is equal to the sum of all resistance. Judge the equivalent resistance when Electricity Class Of Ncert 10th Video Solutions the following are connected in parallel:. What is the resistance of an electric iron connected to the same source that takes as much current as all three appliances and what is the current flows through it?
What are the advantages of connecting electrical devices in parallel with the battery instead of connecting them in Ncert Solutions Of Electricity Class 10th Video series? Following are the advantages of connecting electrical devices in parallel with the battery:. Parallel circuits device the current among the electrical devices so that they can Ncert Solutions Of Electricity Class 10th Video Video Of Electricity Class Solutions Ncert 10th help necessary amount of current to operate properly. Why does the cord of an electric heater not glow while the heating element does?
The resistance of the Ncert Solutions Of Electricity Class 10th Video cord of an electric heater is low compared to the heating element. The heating element of the heater is made up of an alloy, which has more resistance Of Video Ncert Electricity Solutions Class 10th than its constituent metals. So, It becomes too hot and Glow red. Compute the heat generated while transferring C of charge in one hour through a potential Ncert Solutions Of Electricity Class 10th Video Ncert Solutions Of Electricity Class 10th Video difference of 50 V. Compute the heat generated while transferring coulomb of charge in one hour through a potential difference of 50 V. Amount of current,. Therefore, Ncert Solutions Of Electricity Class 10th Video the heat generated is.
Calculate the heat developed in 30 s. Therefore, the amount of heat developed in the electric iron is. The rate of consumption of Ncert Solutions Of Electricity Class 10th Video Ncert Solutions Of Electricity Class 10th Video electric energy in an electric appliance is called electric power.
Hence, the rate at which energy is delivered by a current is the power of the appliance. An electric motor takes 5 A from a V line. Determine the power of the motor and the energy consumed in 2 h. A piece of wire of Ncert Solutions Of Electricity Class 10th Video resistance R is cut into five equal parts. These parts are then connected in parallel. A piece of wire has a resistance R.
The wire is cut Ncert Solutions Of Electricity Class 10th Video into five equal parts. Therefore, the ratio is An electric bulb is rated V and W. The resistance of the bulb remains constant if the supply voltage is reduced to V. If the bulb is operated on V, then the energy consumed by it is given by the expression for power as. Two conducting wires of the same material and of equal lengths and equal diameters are first connected in series and then parallel in a circuit across the same potential Ncert Solutions Of Electricity Class 10th Video difference.
If V is the applied potential difference, then it is the voltage across the equivalent resistance. In this question, t is same for both the circuit. But Ncert Solutions Of Electricity Class 10th Video the current through the equivalent resistance of both the circuit is different.
We could have solved the question directly using H R if in case the current was also same. How is a voltmeter connected in the circuit to measure the potential difference between two points? To measure the potential difference between two points, a voltmeter should be connected in parallel to the points. A copper wire has diameter 0. How much does the resistance change if the diameter is doubled? Resistance 10th Electricity Of Class Solutions Ncert Video R of a copper wire of length l and cross-section A is given by the expression,.
Resistivity of copper,. Hence, length of the wire,. If the Ncert Solutions Of Electricity Class 10th Video diameter of the wire is doubled, new diameter. Therefore, resistance. Therefore, the length of the wire is The plot between voltage and current is called IV characteristic. The Ncert Solutions Of Electricity Class 10th Video voltage is plotted on x -axis and current is plotted on y -axis.
The values of the current for different values of the voltage are shown in Solutions Class Video Of Electricity Ncert 10th the given table. Therefore, the resistance of the resistor is.
When a 12 V battery is connected across an unknown resistor, there is a current of 2. Find the value of the resistance of the resistor. A battery of 9 V is connected in series with resistors of 0.
There is no current division Ncert Video 10th Solutions Class Electricity Of occurring in a series circuit. R is the equivalent resistance of resistances. These are connected in series. Hence, the sum of the resistances will give the value Ncert Solutions Of Electricity Class 10th Video of R. If we connect the resistors in series, then the equivalent resistance will be the sum of the resistors, i.
If we connect the resistors in parallel, Ncert Solutions Of Electricity Class 10th Video then the equivalent resistance will be. Hence, we should either connect the two resistors in series or parallel.
Their equivalent resistance will be the sum. Hence, equivalent Ncert Solutions Of Electricity Class 10th Video resistance will be. Therefore, the total resistance is. Several electric bulbs designed to be used on a V electric supply line, are rated 10 W. How many Ncert Solutions Of Electricity Class 10th Video lamps can be connected in parallel with each other across the two wires of V line if the maximum allowable current is 5 A? Rating of an Ncert Solutions Of Electricity Class 10th Video electric bulb.
What are the currents in the three cases? Total resistance,. Total resistance, is given as. This current will flow through each component of the circuit because there is no division of current in series circuits. Power is given by the expression,. The voltage across each component of a parallel circuit remains the same.
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