WTMA Basic Electrical Principles 4

Question 1

Which direction does conventional current flow in a circuit?

Accepted Answer

From positive terminal to negative terminal

Answer

By convention, current is defined as flowing from the positive terminal through the external circuit to the negative terminal.

Question 2

What component stores electrical charge in a circuit?

Accepted Answer

Capacitor

Answer

A capacitor stores electrical energy as an electric field between two conductive plates separated by an insulator.

Question 3

Three 9-ohm resistors are connected in parallel. What is the total resistance?

Accepted Answer

3 ohms

Answer

For identical resistors in parallel, total resistance = R/n = 9 Ω ÷ 3 = 3 ohms.

Question 4

What is the primary purpose of a ground wire in an electrical system?

Accepted Answer

To provide a safe path for fault current and prevent shock

Answer

A ground wire provides a low-resistance return path for fault current, protecting people from electric shock if a fault occurs.

Question 5

What happens to the brightness of bulbs in a series circuit as more bulbs are added?

Accepted Answer

Each bulb gets dimmer

Answer

Adding bulbs in series increases total resistance, reducing current through all bulbs, which makes each one dimmer.

WTMA - Wiesen Test of Mechanical Aptitude Practice Test