
An ac supply with a peak current of 5.0 A passes
through a 10 W resistor.
Calculate:
a)
the rms
current
b)
the rms pd across the
resistor
c)
the peak
power
d)
the mean power
supplied

The r.m.s. value of an alternating voltage is 12 V.
What is the peak voltage?

In AC waveform is shown in the graph below:

What is the time
period?

What is the
frequency?

What is the peak
value?

What is the r.m.s.
value?

3.0 MW of power is transmitted at a potential
difference of 100 kV along cables of total resistance 5.0
W. Calculate:

The current in the
cables;

The power wasted in the
cables.
