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Electricity Exemplar 3
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A current of 1 ampere flows in a series circuit containing an electric lamp and a conductor of 5ohmWhen connected to a 10v battery calculate the resistance of the electric lamp.
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Draw a circuit diagram of an electric circuit containing a cell, a key an ammeter, a resistor of2ohm in series with a combination of two resistor (4ohm each) in parallel and a voltmeter across the parallel combination of 4ohm resistors ? Give reason.
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What is electrical resistivity ? In a series electrical circuit comprising a resistor made upOf a metallic wire, the ammeter reads 5A. The reading of the ammeter decreases to half when the length of the wire is doubled.why?
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Should the resistance of an ammeter be low or high ? Give reason.
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Three 2ohm resistors, A,B,C are connected as shown in figure12.7 each of them dissipates energy andCan withstand a maximum current that can flaw through the three resistors ?
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Unit of electric power may also be expressed as A)volt ampere B) kilowatt hour C) watt secondD)joule second
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Two resistor of resistance 2ohm and 4ohm when connected to a battery will haveA) same current flowing through them when connected in parallel B)same current flowing through them when connected in series C) some potential difference across them when connected in series D)different potential differences across them when connected in parallel
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An electrical kettle consumes 1kw of electric power when operated at 220v. A fuse wire of whatRatting must be used for it ?
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In electrical circuit two resistor of 2ohm and 4ohm respectively are connected in series to a 6vBattery. The heat dissipated by the 4ohm resistor in 5s will be A)5J B)10J C)20J D)30J
