Answer:
Alternating current
Step-by-step explanation:
The answer is alternating current.
In the alternating current (AC) the magnitude and the sign or direction of the current oscillates with time, it changes cyclically.
The most common is the sinusoidal alternating current (which, when plotted, has a form like the sine function) because with it more efficient transmission of energy is obtained.
This current is used in homes because it is easier to produce and to transport than direct current (unlike alternating current, direct current has a fixed value).