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A fuse is a short length of wire designed to melt and separate in the event of excessive current. Fuses are always connected in series with the component to be protected from overcurrent, so that when the fuse blows it will open the entire circuit and stop current through the component.

Fuse is a temperature sensitive device that protects a circuit when an over-current condition such as a short circuit. occurs.

Relays are switches that open and close circuits electromechanically or electronically.

A switch has 2 states: ON and OFF.
In ON state, it allows current to pass through.
In OFF state, it blocks current.

The word “throw” means, the number of positions the switches poles need to be connected. IFor example SPST- Single Pole, Single-Throw. It has 1 position, where the switch can be connected.

The full form of SPDT is ?Single pole double throw? with respect to switches.
This type of switches has one input and two outputs.
These switches are versatile in nature as it facilitates with two output terminal form a single input.

Fault diverters are commonly used for protection against high voltages. They are made up of fast switches.

Whenever some problem arises, rewirable fuse gives the needed information to the circuit breakers thus saving the appliance from damage.

A body is said to be in stable equilibrium if even after a slight tilt it returns to its previous position

Static electricity causes sparks. These sparks may lead to explosions. If the spark touches dust, it causes fire destroying houses, forests and so on.

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