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Conductors:- Those substances through which electricity can flow are known as conductors. Insulators:- Those substances through which electricity cannot flow are known as insulators. We know that, Work done = Potential difference x Charge moved = 10 x 4 Work done = 40 joules (a) Name a device that helps to measure the potential difference across a conductor.

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If I is the current flowing through a conductor and V is the p.d.

across its ends, then according to the ohm’s law: (a) What is meant by the “resistance of a conductor” ?

(a) Cell or battery helps to maintain potential difference across a conductor. Calculate the amount of electric charge that flows through the circuit. What is the current flowing through the conductor ?

(a) The resistance of an ammeter should be very small so that it may not change the value of the current flowing in the circuit. (c) Which instrument is used to measure electric current ? (d) What is the conventional direction of the flow of electric current ? (c) An ammeter is used to measure electric current. (d) Conventional direction of flow of electric current is from positive terminal of a battery to the negative terminal, through the outer circuit.

(a) Define the unit of resistance (or Define the unit “ohm”).

What happens to the resistance as the conductor is made thinner ?Voltmeter is always connected in parallel across the two points where the potential difference is to be measured.(e) Voltmeter has a high resistance so that it takes a negligible current from the circuit. (b) How many joules of electrical energy does 1 C gain on passing through (i) one cell (ii) all three cells ?(a) Name a device which helps to maintain potential difference across a conductor (say, a bulb). (a) Write down the formula which relates electric charge, time and electric current.If a potential difference of 10 V causes a current of 2 A to flow for 1 minute, how much energy is transferred ? (b) A radio set draws a current of 0.36 A for 15 minutes. (b) One coulomb of charge flows through any cross-section of a conductor in 1 second.The electrons present in rubber are strongly held by the nuclei of its atoms. x charge moved Work done = 120x10J Work done = 1200J.

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