What type of electrical device melts and opens the circuit during overload conditions?

What type of electrical device melts and opens the circuit during overload conditions?

• A. Transformer
• B. Fuse
• C. Capacitor
• D. Relay

Answer: (B)

The device that melts and opens the circuit during overload conditions is a fuse. A fuse serves as a safety mechanism in electrical systems by providing overcurrent protection. When the electrical current exceeds the specified rating of the fuse, it generates heat due to electrical resistance. This heat causes the metal filament within the fuse to melt, breaking the circuit and preventing further current flow. This interruption protects the wiring and connected devices from damage that could result from excessive current, which might otherwise lead to overheating and potentially cause fires. In contrast, transformers are used to change the voltage levels of electrical currents and do not have any protective capabilities regarding overloads. Capacitors are used to store and release electrical energy and play no role in circuit protection from overloads. Relays are electromechanical switches that control the flow of electricity but do not open the circuit in response to overload conditions by themselves. They may work in conjunction with other protection devices but do not provide the direct, thermal response that fuses do.

The device that melts and opens the circuit during overload conditions is a fuse. A fuse serves as a safety mechanism in electrical systems by providing overcurrent protection. When the electrical current exceeds the specified rating of the fuse, it generates heat due to electrical resistance. This heat causes the metal filament within the fuse to melt, breaking the circuit and preventing further current flow. This interruption protects the wiring and connected devices from damage that could result from excessive current, which might otherwise lead to overheating and potentially cause fires.

In contrast, transformers are used to change the voltage levels of electrical currents and do not have any protective capabilities regarding overloads. Capacitors are used to store and release electrical energy and play no role in circuit protection from overloads. Relays are electromechanical switches that control the flow of electricity but do not open the circuit in response to overload conditions by themselves. They may work in conjunction with other protection devices but do not provide the direct, thermal response that fuses do.