You asked: How does a fuse wire protect an electric circuit?

The fuse breaks the circuit if a fault in an appliance causes too much current to flow. This protects the wiring and the appliance if something goes wrong. … If the current going through the fuse is too great, the wire heats up until it melts and breaks the circuit.

How does a fuse protect a circuit when a short circuit occurs?

FUSES and circuit breakers are ”safety valves” built into electrical circuits to protect the wiring against overheating due to an overload or a short circuit. … A fuse or circuit breaker prevents this by ”blowing,” or breaking the circuit, when an overload occurs.

What is an electric fuse explain how a fuse helps to protect a circuit class 7?

Answer: A fuse is a safety device which limits current in circuit as a result it prevents damages to electrical circuits and possible fires. Fuses used in electrical appliances. In order to make a battery the negative terminal of one cell is connected to the positive terminal of the other cell.

How does fuse work in a circuit?

The fuse breaks the circuit if a fault in an appliance causes too much current to flow. The fuse contains a piece of wire that melts easily. … If the current going through the fuse is too great, the wire heats up until it melts and breaks the circuit.

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What will happen when fuse is not in the circuit?

If the fuse is not installed in the circuit, then there is no security barrier to stop excessive currents flowing in the circuit due to short circuit / overloaded / etc. … If the circuit was built without a fuse holder, it will operate and operate normally but without any overload or fault protection.

What is electric fuse and its use?

The electric fuse is a piece of wire having a very low melting point and high resistance. An electric fuse is used as a safety device for the protection of electric circuits and appliances due to short-circuiting or overloading of the electric circuits.

Does a fuse increase resistance?

Explanation: Fuses are safety features in circuits that will melt. … The fuses should be high resistance because typically as the resistance of the fuse increases the temperature increases. This increase in temperature allows the fuse to melt more easily.

Can any wire be used as a fuse wire Why?

No, we cannot use copper wire as fuse wire because the melting point of copper is higher and resistance is low and hence, current can flow through it without melting it or breaking the circuit and it can’t be limited.

Do fuses have resistance?

Fuses are designed to have very low resistance so that they don’t unduly interfere with the circuits that they are protecting. This low resistance means that the voltage drop across the fuse will be very small.