What is the purpose of a ground wire in an electrical circuit?

The purpose of a ground wire in an electrical circuit is to protect users from electric shock. The ground wire is an essential safety feature in electrical systems. It provides a low-resistance path for electrical current to travel to the ground in case of a fault or malfunction, such as a short circuit.

When a fault occurs, such as a live wire touching the metal casing of an appliance, the ground wire ensures that the excess current flows safely into the earth instead of passing through a person who may come in contact with the appliance. This mechanism helps to prevent serious injuries or fatalities due to electric shock. By connecting electrical devices to the ground, this safety measure minimizes the risk of electric shock to users and creates a safer environment for operation.

The other choices do not accurately describe the function of a ground wire. Increasing the circuit's voltage, providing decorative elements, or conducting current to appliances do not capture the primary safety role that ground wires play in preventing electric hazards.