18: AC

Question 1

Define AC

Answer 1

An alternating current refers to a current which changes direction periodically with time

Question 2

Define RMS Current

Answer 2

RMS current refers to a steady current which dissipates heat at the same average rate as the Alternating current in the same resistive load.

Question 3

How to find RMS current

Answer 3

RMS current = SQRT(AREA UNDER CURRENT SQUARED-TIME GRAPH FOR ONE PERIOD/PERIOD)
or: rms current = max current/sqrt(2)