(i) We know the general sinusoidal voltage is given by the equation V = V_{m}sinωt, where V is the instantaneous value of the voltage, V_{m} 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(1.25×10^{4}t-30) volts. Therefore, comparing with the general voltage equation,

V_{m} = 240 V … (i),

ω = 1.25×10^{4} … (ii)

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