Question

what is the purpose of a gfci?
to keep tools from overheating
to prevent electric shocks
to warn you when circuits are overloaded
none of the above

Explanation:

A GFCI (Ground - Fault Circuit - Interrupter) monitors the current in an electrical circuit. If it detects a difference in current between the hot and neutral wires (which can indicate a current leak to ground, a potential shock hazard), it quickly shuts off the power to prevent electric shocks.

Answer:

To prevent electric shocks