BMST - Basic Math and Science Electrical Circuits and Ohm's Law Questions and Answers 5

Question 1

What is the equivalent resistance of three 12 Ω resistors connected in parallel?

Accepted Answer

4 Ω

Answer

For identical resistors in parallel, R_total = R/n = 12/3 = 4 Ω.

Question 2

A 9 V battery is connected to a circuit. The current measured is 0.5 A. What is the resistance?

Accepted Answer

18 Ω

Answer

R = V/I = 9/0.5 = 18 Ω.

Question 3

Which component in a circuit is used to protect against excess current?

Accepted Answer

Fuse

Answer

A fuse contains a wire that melts and breaks the circuit when current exceeds a safe level.

Question 4

In a circuit, voltage is 15 V and power consumed is 45 W. What is the current?

Accepted Answer

3 A

Answer

Using P = VI, I = P/V = 45/15 = 3 A.

Question 5

What is the SI unit of electric current?

Accepted Answer

Ampere

Answer

Electric current is measured in Amperes (A), named after André-Marie Ampère.

BMST - Basic Math and Science Test Practice Test