The work done in moving unit positive charge across two points in an electric circuit is a measure of
[8] Current Electricity
Chapter: [8] Current Electricity
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What are the conditions under which charges can move in a conductor?
[8] Current Electricity
Chapter: [8] Current Electricity
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What do you mean by electric current?
[8] Current Electricity
Chapter: [8] Current Electricity
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What is the direction of electric current?
[8] Current Electricity
Chapter: [8] Current Electricity
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Name the physical quantity which defines the rate of flow of charge.
[8] Current Electricity
Chapter: [8] Current Electricity
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Name the physical quantity which is measured by an ammeter.
[8] Current Electricity
Chapter: [8] Current Electricity
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How many electrons are present in 1 C?
[8] Current Electricity
Chapter: [8] Current Electricity
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A battery of e.m.f. 15 V and internal resistance 3 ohm is connected to two resistors of resistance 3 ohm and 6 ohm in series. Find:
(i) The current through the battery,
(ii) The p.d. between the terminals of the battery.
[8] Current Electricity
Chapter: [8] Current Electricity
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Explain the meaning of the statement 'the current rating of a fuse is 5 A'.
[8] Current Electricity
Chapter: [8] Current Electricity
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'A fuse is rated 8 A'. Can it be used with an electrical appliance of rating 5 kW, 200 V?
[8] Current Electricity
Chapter: [8] Current Electricity
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An electric kettle is rated 3 kW, 250 V. Give reason whether this kettle can be used in a circuit which contains a 13 A fuse.
[8] Current Electricity
Chapter: [8] Current Electricity
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Calculate the electric current supplied by a 12 V battery of an automobile to a starter that develops a power of 2.4 kW.
[8] Current Electricity
Chapter: [8] Current Electricity
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A 720 W heater operates from a 220 V line voltage. Calculate:
(a) The electrical energy consumed by the heater in 3 h.
(b) The cost of electrical energy consumption at the rate of 60 paise per kWh.
[8] Current Electricity
Chapter: [8] Current Electricity
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What is fuse? Name the material of fuse.
[8] Current Electricity
Chapter: [8] Current Electricity
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State two characteristics of a fuse wire.
[8] Current Electricity
Chapter: [8] Current Electricity
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A fuse is a short piece of wire of high ______ and low ______.
[8] Current Electricity
Chapter: [8] Current Electricity
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Complete the following sentence:
A fuse is connected in ........... with the ......... wire.
[8] Current Electricity
Chapter: [8] Current Electricity
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Complete the following sentence:
Fuse wire has a ............ Melting point and it is made of an alloy of ......... and if the current in a circuit rises too high, the fuse wire ...........
[8] Current Electricity
Chapter: [8] Current Electricity
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Calculate the amount of energy transferred by a 10 A electric current flowing through a resistor of 5 o for 15 minutes.
[8] Current Electricity
Chapter: [8] Current Electricity
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A 200 v electric transfer draws an electric current of 11 A. What is its electrical resistance?
[8] Current Electricity
Chapter: [8] Current Electricity
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