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NCERT Solutions Class 10 Science Chapter 12 Electricity - Download Free PDFs

Page No: Ques: 1. What does an electric circuit mean? Ans: A continuous and closed path of an electric current is called an electric circuit. An electric circuit consists of electric devices, source of electricity and wires that are connected with the help of a switch.

Ques: 2. Define the unit of current. Ans: The unit of electric current is ampere A. Ques: 3. Calculate the number of electrons constituting one coulomb of charge. Ans: One electron possesses a charge of 1. Name a device that helps to maintain a potential difference across a conductor. Ans: Any source of electricity like a battery, cell, power supply. What is meant by saying that the potential difference between two points is 1 V?

Ans: If 1 J of work is required to move a charge of amount 1 C from one point to another, then it is said that the potential difference between the two points is 1 V. How much energy is given to each coulomb of charge passing through a 6V battery? Ans: The energy given to each coulomb of charge is equal to the amount of work which is done in moving it. On what factors does the resistance of a conductor depend?

Ans: The resistance of a conductor depends upon the following factors: a Length of the conductor b Cross-sectional area of the conductor c Material of the conductor d Temperature of the conductor Ques: 2. Will current flow more easily through a thick wire or a thin wire of the same material, ncert solutions of electricity class 10th inc connected to the same source?

Thicker the wire, lower is the resistance of the wire and vice-versa. Therefore, current can flow more Ncert Solutions Class 10th Chapter 1 Journal easily through a thick wire than a thin wire. Let the resistance of an electrical component remains constant while the potential difference across the two ends of the component solufions to half of its former value. What change will occur in the current through it? Ques: 4. Why are coils of electric toasters and electric irons made of solugions alloy rather than a pure ncert solutions of electricity class 10th inc Ans: The clasx of an alloy is higher than the pure metal.

Moreover, at high temperatures, the alloys do not melt readily. Hence, the coils of heating appliances such as electric toasters and electric irons are made of an alloy rather than a pure metal. Ques: 5. Use the data in Table This implies that iron is a better 10tb than mercury.

Hence, it is the best conductor. What would be the readings in the ammeter and the voltmeter? Ans: An ammeter should be connected in the circuit in series with the resistors. To measure the potential difference across the resistor it should be connected in parallel, as shown in the following figure. The resistances are connected in series. The reading of the voltmeter will be 2.

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 through it?

Let R be the equivalent resistance of the circuit. Therefore, the resistance of the electric electdicity is What are the advantages of connecting electrical devices in parallel with the battery instead of connecting them in series?

Ans: Advantages of connecting electrical devices in parallel: i When the appliances are connected in parallel with the battery, each appliance gets the same potential difference as that electrcity battery which is not possible in series connection.

This is possible only in parallel connection, as in series connection, the same current flows through all devices, irrespective of their resistances. If they are connected in parallel. All the resistors are connected ncert solutions of electricity class 10th inc series. Therefore, their equivalent resistance will be given as. Why does the cord of an electric heater not glow while the heating element does? Electricityy The cord of an electric heater is made up of metallic wire such as copper or aluminium which has low resistance while the heating element is made up of an alloy which has more resistance than its constituent metals.

Compute the heat generated while transferring coulombs of charge in one hour through a potential difference of 50 V. Calculate the heat developed in 30s. Therefore, the amount of heat developed in the electric iron is 1. What determines the rate at which energy is delivered by a current? Ans: The rate of consumption of 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 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 into five equal soluutions. All the five parts are connected in ncert solutions of electricity class 10th inc. Which of the following terms does not represent electrical power in a circuit?

An electric bulb is rated V and W. When it is operated on V, the power consumed will be. The resistance of the bulb remains constant if the supply voltage is reduced to V. If the bulb is operated electriicty V, then the energy consumed by it is given by the expression for power as. Therefore, the power consumed will be 25 W.

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 difference. Let, R be the resistance of the two eledtricity. If V is the applied potential difference, then it is the voltage across the equivalent resistance.

The equivalent resistance of the parallel connection is. So; the ratio of heat produced is. In this question, f is same for both the circuit. But the current through rlectricity equivalent resistance of both the circuit is different. How is a voltmeter connected in the circuit to measure the potential difference between two points? Ans: To measure the potential difference between two points, a voltmeter should be connected in parallel to the points.

Ques: 6. A copper wire has a diameter ncert solutions of electricity class 10th inc. How much does the resistance change if the diameter is doubled? Therefore, the length of the wire is Ques: 7. V volts. Ans: Plot a graph between V sokutions I and calculate the resistance of that resistor. The plot between voltage and current is called IV characteristic.

The voltage is plotted on x-axis and current is plotted ncert solutions of electricity class 10th inc y-axis. The values of the current for different values of the voltage are ncert solutions of electricity class 10th inc in the given table. The IV characteristic of the given resistor is plotted in the following figure.

The slope of the line gives the value of resistance R as, Therefore, the resistance of the resistor is nert. Ques: 8. 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. Ans: There is no current division occurring in a series circuit. These are connected in series.

Hence, the sum of the resistances will give the value of R. Ques: Several electric bulbs designed to be used on Ncert Solutions Of Class 10th Maths Exercise 12.3 An a V electric supply ncert solutions of electricity class 10th inc, are rated 10 W.

How many lamps can be connected in parallel with each other across the two wires of V Ncert Solutions Class 10th 5.3 Inc line if the ncert solutions of electricity class 10th inc allowable current is 5 A? Let R is the Total Resistance of the circuit for x number of electric bulbs. Chapter 3 - Metals and Non-metals. Question 1: On what factors does the resistance of a conductor depend Answer: Resistance of a conductor depends upon: i Resistivity of the material. Answer: Question 3: An electric iron of resistance 20 Q takes a current of 5 A. The students can easily download the PDF version and study from the solution set at their convenience. The current flowing through a resistor connected in an electric circuit and the potential difference applied across its ends are shown in figure alongside. These parts are then connected in parallel.   Updated:

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