Direct current (DC)

The video tutorial explains the difference between direct current (DC) and alternating current (AC). DC flows in one direction and is supplied by cells and batteries, while AC continuously reverses direction and is supplied by mains electricity. Phone chargers convert AC to DC for storage in phone batteries.

What is the main characteristic of a direct current?

• It flows in a single direction.

• It does not flow at all.

• It flows in multiple directions.

• It flows in a circular path.

Which devices typically supply direct current?

• Solar panels

• Cells and batteries

• Transformers

• Generators

How does alternating current differ from direct current?

• It is only used in batteries.

• It flows in a single direction.

• It continuously reverses direction.

• It does not require a circuit.

What is the role of a phone charger in terms of current?

• It generates alternating current.

• It converts alternating current to direct current.

• It stores alternating current.

• It converts direct current to alternating current.

Why is direct current important for phone batteries?

• It allows the battery to charge faster.

• It can be stored by the battery.

• It is cheaper to produce.

• It is more environmentally friendly.