NSAA NSAA Physics - Electricity and Magnetism

Question 1

A resistor has a voltage of 12 V across it and a current of 3 A through it. What is its resistance?

Accepted Answer

4 Ω

Answer

Using Ohm's Law: R = V/I = 12/3 = 4 Ω.

Question 2

Three resistors of 2 Ω, 3 Ω, and 5 Ω are connected in series. What is the total resistance?

Accepted Answer

10 Ω

Answer

In series, total resistance = 2 + 3 + 5 = 10 Ω.

Question 3

Two resistors of 6 Ω and 3 Ω are connected in parallel. What is the combined resistance?

Accepted Answer

2 Ω

Answer

1/R = 1/6 + 1/3 = 1/6 + 2/6 = 3/6 = 1/2, so R = 2 Ω.

Question 4

A charge of 4 C passes through a wire in 2 seconds. What is the electric current?

Accepted Answer

2 A

Answer

Current I = Q/t = 4/2 = 2 A.

Question 5

A 60 W bulb runs on a 120 V supply. What current does it draw?

Accepted Answer

0.5 A

Answer

Current I = P/V = 60/120 = 0.5 A.

NSAA - Natural Sciences Admissions Assessment Practice Test