Question

in a ground - side switched circuit, when the circuit is off, voltage is present to which point?
a) the switch
b) the load
c) the battery
d) the fuse

Explanation:

In a ground - side switched circuit, when the circuit is off (open - circuit), the power source (battery) still provides voltage. The switch is open, so there is no current flow. But the battery maintains its potential difference. The load (B) would not have voltage across it as the circuit is open. The fuse (D) is in series and when the circuit is off (assuming no fault), it just has the same voltage as the source side. The switch (A) has voltage across it (source voltage). But the battery (C) is the source of voltage. However, if we consider the points in the circuit, when the circuit is off, the load is connected to the positive side of the battery (through other components like fuse etc.). So the load has voltage (because it is connected to the positive terminal of the battery, and the switch is open, so the negative terminal (ground side) is disconnected).

Answer:

B. The load