Question

If you triple the voltage across a resistor while at the same time cutting its resistance to one-fifth its original value, what happens to the current in the resistor?

If you triple the voltage across a resistor while at the same time cutting its resistance to one-fifth its original value, what happens to the current in the resistor?

	it increases by 15 times
	it doubles
	it increases by five times
	you can't tell from the data given

Answer 1

I = V/R = 3V/R/5 = 15 V/R

so it increases by 15 times

Answer 2

as per ohms law V = iR

if V is tripled and R is reduced to 1/5th

i = v/R

i' = 3V/R/5 = 15 i

it increases by 15 times

Answer 3

Increaswes by 15 times.

I = V / R

I' = (5V) / (R/5) = 15 V / R = 15 I