Homemade Alternating Current director

Define Alternating current and Direct current.

Distinguish between alternating current and direct current by giving two points.

Alternating Current and Direct Current|Questions

Define (a) alternating current (b) direct current

Both alternating current and direct are measured in ampers. But how is the ampere defined for an alternating current ?

What is alternating current ?

Alternating current is transmitted:

Can we use galvanometer to measure alternating current ?