Question

If the voltage of a circuit is reduced to half and the resistance is doubled,the current becomes-

Answer 1

Answer:

Current reduces to 4 times the initial value

Explanation:

From Ohm's Law,

V = IR or

I = V/R

Initially,

Voltage = V

Current = I

Resistance = R

Hence,

I = V/R

When voltage and resistance are changed,

Voltage = V/2

Resistance = 2R

Current = I'

Hence,

I' = (V/2) / 2R

I' = V/4R

I' = 1/4 V/R

I' = I/4

Therefore, the current reduces by 4 times