EIAT Basic Electrical Principles 3

Question 1

What does a diode primarily do in an electrical circuit?

Accepted Answer

Allows current to flow in only one direction

Answer

A diode is a semiconductor device that permits current to flow in one direction only, acting as a one-way valve.

Question 2

What is the relationship between voltage (V), current (I), and resistance (R) in Ohm's Law?

Accepted Answer

V = I × R

Answer

Ohm's Law states that voltage equals current multiplied by resistance: V = I × R.

Question 3

Which component is used to protect a circuit from excess current by breaking the circuit?

Accepted Answer

Fuse

Answer

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

Question 4

What is the voltage across a 15-ohm resistor carrying 3 amperes of current?

Accepted Answer

45 V

Answer

Using Ohm's Law: V = I × R = 3 × 15 = 45 V.

Question 5

In electrical terms, what is 'grounding' primarily intended to do?

Accepted Answer

Provide a safe path for fault current to prevent shock

Answer

Grounding provides a low-resistance path for fault current to flow safely to earth, protecting people from electric shock.

EIAT - Elevator Industry Aptitude Test Practice Test