Resistance of a material always decreases if
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The rating of a fuse wire is always expressed in
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The minimum charge on an ion is
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Current velocity through a copper conductor is
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For which of the following 'ampere second' could be the unit?
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An instrument which detects electric current is known as
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It becomes more difficult to remove
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Two resistances Rl and Ri are connected in series across the voltage source where Rl > Ri. The largest drop will be across
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A closed switch has a resistance of
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A 40 W bulb is connected in series with a room heater. If now 40 W bulb is replaced by 100 W bulb, the heater output will:
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Which of the following materials has the least resistivity ?
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Three 60 W bulbs are in parallel across the 60 V power line. If one bulb burns open
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Two bulbs of 500 W and 200 W rated at 250 V will have resistance ratio as
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For testing appliances, the wattage of test lamp should be
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A rheostat differs from potentiometer in the respect that it
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Are the materials having electrical conductivity much less than most of the metals but much greater than that of typical insulators.
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In a series circuit with unequal resistances
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The resistance of a conductor varies inversely as
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A resistance having rating 10 ohms, 10 W is likely to be a
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If the efficiency of a machine is to be high, what should be low?
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