IST Electrical and Electronic Knowledge

Question 1

What is the standard unit of measurement for electrical resistance?

Accepted Answer

Ohm

Answer

Ampere

Answer

Volt

Answer

Watt

Question 2

According to Ohm's Law, if voltage is 120V and resistance is 30 Ohms, what is the current?

Accepted Answer

4 A

Answer

2 A

Answer

3 A

Answer

5 A

Question 3

What color is the standard neutral wire in US residential and light commercial wiring?

Accepted Answer

White or gray

Answer

Black

Answer

Green

Answer

Red

Question 4

What device is used to protect an electrical circuit from damage caused by excess current?

Accepted Answer

Fuse or circuit breaker

Answer

Capacitor

Answer

Transformer

Answer

Relay

Question 5

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

Accepted Answer

To provide a safe path for fault current

Answer

To carry the main current load

Answer

To regulate voltage levels

Answer

To increase circuit resistance

Question 6

If two resistors of 10 Ohms each are connected in series, what is the total resistance?

Accepted Answer

20 Ohms

Answer

5 Ohms

Answer

10 Ohms

Answer

100 Ohms