Final answer:
Ground Fault Circuit Interrupters (GFCI) detect current running through ground wires to prevent shock hazards, while thermal imaging tools monitor voltage waveforms to detect overheating and prevent thermal hazards.
Step-by-step explanation:
The devices that look for current running through ground wires are known as Ground Fault Circuit Interrupters (GFCI). These devices are critical for preventing shock hazards by detecting the loss of current to unintentional paths such as through a person's body, which could occur if there is a fault in an appliance or its wiring. Thermal imaging tools and instruments look for overheating by monitoring the waveform of the circuit voltage. Overheating can be a significant risk, which might happen if the wires are overloaded with too great a current, potentially leading to fire hazards. Circuit breakers and fuses are typically used to prevent these thermal hazards by interrupting excessive currents.