Final answer:
A fuse is installed in an electric circuit as a safety device to protect it from damage caused by excessive currents as a result of a short circuit. The wire in the fuse melts when overheated, breaking the circuit and stopping the flow of electricity.
Step-by-step explanation:
To protect an electric circuit from damage by a "short," a device called a fuse is installed. This statement is true. A fuse acts as a safety device that interrupts the flow of excessive current to prevent thermal hazards. It consists of a short piece of wire, which is placed under tension and has a low melting point, between two contacts. When too much current flows through the circuit, the wire in the fuse heats up and breaks at its rated current, thereby stopping the flow of electricity and protecting the rest of the circuit. While the fuse must be replaced after it acts, it is crucial for preventing potential damage or fire from occurring due to a short circuit.