Final answer:
To assist a co-worker shocked by an electrical circuit, do not touch them directly; instead, turn off the power or use an insulator to separate them from the circuit.
Step-by-step explanation:
If a co-worker is suffering a shock from an electrical circuit and cannot let go of the circuit, the first action to take is not to touch the person directly, as you may become a part of the electrical circuit yourself. It is crucial to first cut off the supply of electricity, if possible, by turning off the circuit breaker or unplugging the appliance. If this cannot be done safely, use an item made of insulating material such as wood or plastic to push the person away from the source of electricity. In certain circumstances, giving the fist a hard knock, blow, or jar with an insulator might be necessary to free the individual from the circuit if the muscles have contracted and they cannot let go.