past paper notes- alternating currents Flashcards
1
Q
By reference to heating effect, explain what is meant by the root mean square value of an alternating current? /2
A
the steady current that produces the same heating effect
2
Q
the positive side of the resistor will be where the end sides of the diodes meet
A
3
Q
The mean value of an alternating current is zero.
Explain why heating occurs when there is an alternating current in a resistor?
A
ac is always changing direction
but heating effect is independent of current direction
