Transistor switch may not necessarily have a resistive load always. Depending on the requirement, the load can either be inductive or capacitive. A transistor switch with inductive and capacitive loads is studied in the sections below.
Consider a transistor switch, shown in Fig. 6.44 for which the load is an inductor, L in parallel with R. As the dc resistance offered by L is negligible, to ensure that the current in the transistor does not abruptly rise to a very large value when the transistor is driven into saturation, a resistance RC is added in series with the combination to limit the saturation current.
FIGURE 6.44 Switch with inductive load
The gating signal ...