(i) We know the general sinusoidal voltage is given by the equation V = Vmsinωt, where V is the instantaneous value of the voltage, Vm is the maximum value of the voltage in a cycle and ωt is the angle at a particular instant.
The given voltage is V = 240sin(1.25×104t-30) volts. Therefore, comparing with the general voltage equation,
Vm = 240 V … (i),
ω = 1.25×104 … (ii)
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