Question

Which of the following doesn’t support Ohm`s Law?

A) V = RI (Other Physical conditions remain constant)
B) V/R = I (Other Physical conditions remain constant)
C) I/V = R (Other Physical conditions remain constant)

Answer 1

Answer:

According to Ohm's Law-

I

V

=constant

And hence

V

I

=constant

I

V

=R

V=I×R

Hence the option that is I=V×R is incorrect.

Answer-(C)

Explanation:

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Answer 2

CALCULATING RESISTANCE: AN AUTOMOBILE HEADLIGHT

What is the resistance of an automobile headlight through which 2.50 A flows when 12.0 V is applied to it?

Strategy

We can rearrange Ohm’s law as stated by I = V/R and use it to find the resistance.

Solution

Rearranging I = V/R and substituting known values gives

R

=

V

I

=

12

.

0 V

2

.

50 A

=

4

.

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