Explain what is meant by the root-mean-square (r.m.s.) value of an alternating voltage.
An alternating voltage 
is represented by the equation
where is measured in volts and 
is in seconds. For this alternating voltage, determine
the peak voltage,
the r.m.s. voltage,
the frequency.
The alternating voltage in (b) is applied across a resistor such that the mean power output from the resistor is 
. Calculate the resistance of the resistor.
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