In the circuit shown,
R
3
is greater than
R
2
, and
R
2
is greater than
R
1
.
is the electromotive force of
the battery whose internal resistance is
negligible.
Which of the three resistors has the
greatest current flowing through it?
a)
R
1
b)
R
2
c)
R
3
d)
R
1
and
R
2
are equal,
and greater than
R
3
e)
They are all equal

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The plot of electric current as a function of time for an
alternating current is a
sinusoidal curve
.
The average value of an ordinary alternating current is zero.
The power dissipated in a resistance is proportional to the
square of the current.
The
effective current
or
rms current
is obtained by squaring
the current, averaging this value over time, and taking the
square root of the result.
The effective current
I
eff
is 0.707 times the peak current
I
peak
.