Question

Find the current resulting from 3.5 V in a circuit with a net resistance of 3.6 Ω.

0.97 A
1.0 A
3.4 A
13 A

When you turn on the radio in your car, it has a resistance of 4.0 Ω. What battery voltage is required to supply 3.0 A of current to the radio?

0.75 V
1.3 V
10. V
12 V

What is the resistance of an operating laptop computer that has an 11 V battery and consumes 15 W of power?

1.36 Ω
8.1 Ω
20. Ω
170 Ω

What is the power of a 3.7 V cell phone battery that provides 2.0 A of current?

0.54 W
1.1 W
1.9 W
7.4 W

Answer 1

1) We know, I = V/R
I = 3.5 / 3.6 = 0.97 A

2) We know, V = R * I
V = 4 * 3 = 12 V

3) We know, R = V²/P
R = 11²/15 = 121/15 = 8.1 Ohm

4) We know, P = V * I
P = 3.7 * 2 = 7.4 watts

In short, Your Answers are:
1)Option A
2)Option D
3)Option B
4)Option D

Hope this helps!

Answer 2

1.1 w is the answer for the last one