Question

A fuse in an electric circuit acts as a :
A. current multiplication
B. voltage multiplication
C. power multiplier
D. safety device

Answer 1

Hint:Everything attached in the circuit is a component of the circuit diagram. a circuit diagram shows the actual electrical connections. Some commonly used components in the circuit are wire, resistor, rheostat, cell, capacitor, diode etc. A fuse in an electrical circuit acts as a safety device. It allows only a desired amount of current to flow through it.

Complete answer:
A fuse is a safety device used in the electrical circuit to protect the appliances from being destroyed by excessive flow of current through them. The working principle of a fuse is the heating effect of electric current. When excessive current flows through the circuit the wire of the fuse gets melted due to its lower melting point and open circuits the entire electric circuit. This protects the appliances connected to the electric circuit from being damaged due to the heavy flow of current through it. In this way the fuse acts as a safety device in an electrical circuit.

Hence, option D is correct.

Note:The fuse acts as a safety device in an electrical circuit as it cuts the flow of current through the circuit during excessive flow of current. One thing we need to keep in mind is that the fuse is connected in series with the electrical circuit. It consists of a wire made up of conducting material with low melting point such as lead and tin.A fuse allows only a permitted value of current to flow through it. If the current exceeds this value the fuse gets open circuited and thus stops the flow of current through the entire electrical circuit.