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CURRENT ELECTRICITY

Current Electricity
A light bulb draws 300 mA when the voltage across it is 240 V. The resistance of the light bulb is

400 Ω
800 Ω
600 Ω
1000 Ω

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Current Electricity
A current of 16 amperes divides between two branches in parallel of resistances 8 ohms and 12 ohms respectively. The current in each branch is

6.4 A, 6.9 A
6.4 A, 9.6 A
4.6 A, 9.6 A
4.6 A, 6.9 A

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Current Electricity
Which of the following material has nearly zero temperature co-efficient of resistance?

Copper
Porcelain
Manganin
Carbon

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Current Electricity
Varistors are

Resistor with zero temperature co-efficient
Carbon resistors
Non-linear resistors
Insulators

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Current Electricity
Ohm's law is not applicable to

Carbon resistors
Circuits with low current densities
Vaccum tubes
High voltage circuits

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