Question

an example of an unplanned open is:
a) an open switch
b) a corroded battery cable
c) a blown fuse
d) a light

Explanation:

An open switch is a planned way to open a circuit. A light is not an open. A blown fuse is a planned safety device that opens when current is too high. A corroded battery cable is an unplanned issue that can cause an open in the circuit.

Answer:

B. a corroded battery cable