Electric Current Quiz

What is direct current (d.c.)?

• Current that always flows in one direction.

• Current that constantly changes direction.

• Current that flows in lots of directions.

• Current that does not flow.

What is alternating current (a.c.)?

• Current that always flows in one direction.

• Current that constantly changes direction.

• Current that flows in lots of directions.

• Current that does not flow.

What produces direct current?

• Generators

• Transformers

• Cells and batteries

What produces alternating current?

• Cells and batteries

• Generators

• Transformers

Where is direct current commonly used?

• In mains electricity to run things like washing machines and fridges

• In electronic circuits (e.g. computers, mobile phones)

Why can't direct current be transferred efficiently over large distances?

• It requires transformers.

• It loses energy over long distances.

• It is too powerful.

• It is too weak.

How can alternating current be transferred efficiently over large distances?

• By using cells and batteries

• By using generators

• By using transformers