A fuse is exactly the same. It's a thin piece of wire designed to carry a limited electrical current. If you try to pass a higher current through the wire, it'll heat up so much that it burns or melts. When it melts, it breaks the circuit it's fitted to and stops the current flowing.

An Electric Fuse and Its Working

An electric fuse is a safety device that is used to protect electrical circuits from excessive current flow. It is a small, thin piece of wire or strip that melts when the current passing through it exceeds a certain limit. The primary function of a fuse is to prevent damage to electrical equipment and to prevent the risk of fire due to overheating.

Working of an Electric Fuse:
1. Construction: An electric fuse consists of a fuse element, fuse carrier, and terminals. The fuse element is typically made of a metal or alloy with a low melting point, such as copper, silver, or tin. It is designed to be a weak point in the circuit, which will break and interrupt the flow of current if the current exceeds the rated value of the fuse. The fuse carrier holds the fuse element and is usually made of ceramic or porcelain to provide insulation. The terminals are used to connect the fuse to the circuit.

2. Rated Current: Every fuse has a specific rated current, which indicates the maximum amount of current it can safely carry without blowing. This rating is usually marked on the fuse itself.

3. Overcurrent: When an electrical circuit experiences an overcurrent condition, such as a short circuit or overload, the current flowing through the fuse increases rapidly. This excessive current causes the fuse element to heat up.

4. Fuse Melting: As the current exceeds the rated value of the fuse, the fuse element heats up due to its resistance. The heat causes the fuse element to reach its melting point, and once it exceeds this point, the fuse wire or strip melts and breaks.

5. Current Interruption: When the fuse wire or strip melts, it creates an air gap in the circuit, interrupting the flow of current. This prevents further current flow and protects the electrical equipment from damage.

6. Replacement: Once a fuse blows, it needs to be replaced with a new one. The replacement fuse should have the same current rating as the original fuse to ensure proper protection.

Related Concepts:
- Electric Bulb: An electric bulb is a device that converts electrical energy into light energy. It consists of a filament, which is heated by the passage of electric current, causing it to emit light.
- Electric Current and its Effects: Electric current is the flow of electric charge through a conductor. It can produce various effects, including heating, magnetic effects, and chemical effects, depending on the nature of the circuit and the materials involved.
- Class 7 Science: These concepts are typically taught in Class 7 Science as part of the curriculum to provide a basic understanding of electricity and its applications.

In summary, an electric fuse is a safety device that protects electrical circuits by melting when the current exceeds its rated value. It works by interrupting the flow of current when the fuse element melts, preventing damage to electrical equipment and reducing the risk of fire. Understanding the working of an electric fuse is crucial for ensuring electrical safety.

A fuse is a safety device in an electric circuit which prevents short circuits .Its use is to melts and breaks the electric circuit in case of overload.