WTMA Basic Electrical Principles 2

Question 1

A wire carries 3 amperes of current for 10 seconds. How many coulombs of charge passed through the wire?

Accepted Answer

30 coulombs

Answer

Charge (Q) = Current (I) × Time (t), so Q = 3 A × 10 s = 30 coulombs.

Question 2

Which material is the BEST conductor of electricity?

Accepted Answer

Copper

Answer

Copper has very low electrical resistance and is one of the best practical conductors used in wiring.

Question 3

If voltage across a resistor doubles while resistance stays the same, what happens to the current?

Accepted Answer

It doubles

Answer

By Ohm's Law (I = V/R), doubling V while R stays constant doubles the current.

Question 4

What does a fuse do in an electrical circuit?

Accepted Answer

Breaks the circuit when current is too high

Answer

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

Question 5

Two resistors of 6 ohms each are connected in series. What is the total resistance?

Accepted Answer

12 ohms

Answer

In a series circuit, total resistance is the sum of all resistors: 6 + 6 = 12 ohms.

WTMA - Wiesen Test of Mechanical Aptitude Practice Test