QUESTION FOUR

$($a$)$ Sketch and explain the circuit and waveforms of a single $-$phase full bridge inverter

$($b$)$ Construct a table to indicate the following on it for both positive and negative cycle

$($i$)$ Load voltage, current and conducting devices

$($c$)$ A single$-$phase half rectifier feeds a $15$ resistance. The supply voltage is $230$ V $($rms$).$ The firing angle is $\frac{}{2},$ find $($i$)V_{dc},I_{dc},V_{rms}$ and $I_{rms}$