### Write down an expression for the voltage waveform, and sketch the waveforms of the harmonic components.

An a.c. voltage, V, comprises of a fundamental voltage of 100 V rms at a frequency of 120 Hz, a 3rd harmonic which is 20% of the fundamental, a 5th harmonic which is 10% of the fundamental and at a phase angle of 1.2 radians lagging. (i) Write down an expression for the voltage waveform. (ii) Sketch the waveforms of the harm