Alternating current (AC) is defined as:

Alternating current (AC) is defined as:

• A. An electric current that reverses its direction many times a second at regular intervals
• B. A current that never changes
• C. A current produced only by batteries
• D. A current that is always decreasing

Answer: (A)

Alternating current is a flow where the direction of the current reverses periodically, so it changes back and forth many times each second at a regular rate. This periodic reversal is what we mean by the current having a frequency (like 50 Hz or 60 Hz in power supplies). The magnitude of the current may also vary as it alternates, but the key feature is the direction changing repeatedly. This distinguishes it from direct current, which flows in one direction and can be produced by batteries. The idea that it is produced only by batteries is incorrect, since AC is typically generated and supplied by power plants and electrical networks. Also, AC is not always decreasing; it continually reverses direction instead of just getting smaller.

Alternating current is a flow where the direction of the current reverses periodically, so it changes back and forth many times each second at a regular rate. This periodic reversal is what we mean by the current having a frequency (like 50 Hz or 60 Hz in power supplies). The magnitude of the current may also vary as it alternates, but the key feature is the direction changing repeatedly. This distinguishes it from direct current, which flows in one direction and can be produced by batteries. The idea that it is produced only by batteries is incorrect, since AC is typically generated and supplied by power plants and electrical networks. Also, AC is not always decreasing; it continually reverses direction instead of just getting smaller.