Bennett Mechanical Test Electricity and Circuits 2

Question 1

In a series circuit with three identical light bulbs, what happens to the others if one bulb burns out?

Accepted Answer

They go out

Answer

A series circuit has one path, so a break at any bulb stops current to all.

Question 2

What is the unit of electrical resistance?

Accepted Answer

Ohm

Answer

Resistance is measured in ohms, symbolized by the Greek letter omega.

Question 3

Using Ohm's law, what current flows through a 10-ohm resistor connected to a 20-volt source?

Accepted Answer

2 amps

Answer

Current equals voltage divided by resistance, so 20 V ÷ 10 Ω = 2 A.

Question 4

Which material is the best conductor of electricity?

Accepted Answer

Copper

Answer

Copper has many free electrons, making it an excellent conductor used in wiring.

Question 5

In a parallel circuit, how does the voltage across each branch compare?

Accepted Answer

It is the same across each branch

Answer

Each branch of a parallel circuit receives the full source voltage.

Bennett Mechanical Test Practice Test