Physics Question

Question

Dear experts,

Im having trouble answering the following question:

If the potential difference across an ohmic conductor is halved, the dissipated power:

1) increases by a factor of 4

2) decreases by a factor of 4

3) decreases by a factor of 2

4) increases by a factor of 2

5) remains unchanged

Any help would be appreciated!

Answer 1

The right answer is 2 - decreases by a factor of 4.

You must use the formula

P = V² / R

You can see right away that if voltage V is 2 times less, than power P is 4 times less.

Answer 2

i agrre with above the vo;tage is decreased by by 2 so the power is 1/4