Question

Choose the statement which is not correct in the case of an electric fuse.

• A. Fuses are inserted in electric circuits of all buildings.
• B. There is a maximum limit on the current that can safely flow through the electric circuits.
• C. There isn't a minimum limit on the current that can safely flow in the electric circuits.
• D. If a proper fuse is inserted in a circuit it will blow off if the current exceeds the safe limit.

Answer 1

The correct option is C

There isn't a minimum limit on the current that can safely flow in the electric circuits.

The explanation for the correct option:

In the case of option ($\mathrm{C}$)

1. We use electrical devices in our homework on a specific range of current.
2. But due to short circuits or overloading, it is seen that there is a sudden increase in the current.
3. The increase in the current in some cases is so massive that it blows up the electrical devices and sometimes catches fire, thus damaging the property.
4. To prevent such mishaps, a fuse is installed in the primary circuit of all the buildings so that if there is a sudden increase in the current, the fuse blows up and the circuit is broken.
5. Only a certain amount of current is allowed to flow through the circuits, i.e., the maximum tolerance of the fuse up to which it can work smoothly.
6. If the current overshoots the maximum limit mentioned on the fuse, the fuse wire will melt due to overheating and thus breaking the circuit.

The explanation for the incorrect option:

In the case of option($\mathrm{A}$)

1. An electric fuse is required for all electrical equipment because it is a safety tool and monitors the excessive flow of electrical energy.
2. The Miniature Circuit Breaker ($\mathrm{MCB}$) is used nowadays instead of electric shocks in electrical circuits.

In the case of option ($\mathrm{B}$)

1. The property of a material that limits current flow is known as its resistance ($\mathrm{R}$); the resistance unit is the ohm ($\mathrm{\Omega }$).
2. Resistance to alternating current is more appropriately called impedance, but in this application, resistance and impedance can be considered equivalent.
3. An electric fuse has a maximum current limit that can flow safely into electrical circuits.
4. Hence option ($\mathrm{B}$) is incorrect.

In the case of option ($\mathrm{D}$)

1. In the case of an electric fuse, there is a maximum current limit that can flow safely into electrical circuits.
2. Hence option ($\mathrm{D}$) is incorrect.

Therefore, option ($\mathrm{C}$) is the correct choice.