The turn-on and turn-off switching energy shown in Figure 7-10 represent the energy absorbed by the low-side device during the turn-on and turn-off transients of the circuit. As the circuit in Figure 8-1 represents a boost converter with input shorted to output, the switching energy is dissipated in the low-side device. The turn-on transition is lossy while the turn-off transition is essentially lossless with the output capacitance energy charged by the inductor current. The turn-on and turn-off losses have been calculated from experimental waveforms by integrating the product of the drain current with the drain-source voltage over the turn-on and turn-off times, respectively. The skew of probes for voltage and current are very important for accurate measurement of turn-on and turn-off energy.