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Question

What happens to the resistance of a circuit if the current through it is doubled


Solution

Solution:

As per ohm’s law,

Current through a circuit=voltage applied / resistance of the circuit

So Current is directly proportional to Voltage and inversely proportional to Resistance.

If you are doubling the current, it will increase the voltage or decrease the resistance or a combination of both.

So the resistance will remain constant if current is doubled through doubling the voltage supply. Similarly resistance will have to be halved if voltage is to remain constant, & so on.

Note: Assuming that voltage doesn’t change, if the current through circuit is doubled, then the resistance would have to reduce by half.
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