BMST - Basic Math and Science Electrical Circuits and Ohm's Law Questions and Answers 4

Question 1

What is the total power dissipated by a 4 Ω resistor carrying 3 A of current?

Accepted Answer

36 W

Answer

P = I²R = 3² × 4 = 9 × 4 = 36 W.

Question 2

Which of the following best describes an open circuit?

Accepted Answer

A broken path that stops current flow

Answer

An open circuit has a break in the path, preventing any current from flowing.

Question 3

In a parallel circuit, if one branch burns out, what happens to the other branches?

Accepted Answer

They continue to operate normally

Answer

In a parallel circuit, each branch has its own path, so other branches are unaffected by one branch failing.

Question 4

Three 6 Ω resistors are connected in series. What is the total resistance?

Accepted Answer

18 Ω

Answer

Series total resistance = 6 + 6 + 6 = 18 Ω.

Question 5

What does a short circuit occur when?

Accepted Answer

Current has a near-zero resistance path

Answer

A short circuit occurs when current finds an unintended low-resistance path, causing dangerously high current flow.

BMST - Basic Math and Science Test Practice Test