Question

1) What is heating effect of electric current?
2)Draw the diagram of an electric bulb and label the parts.
3) Why is the filament of a bulb made of a thin tungsten wire?
4.What is fuse? Explain the importance of a fuse in an electric circuit.
5) What is MCB ? Write the advantage of MCB ?
143 pm​

Answer 1

Answer:

1) When an electric current is passed through a conductor, it generates heat due to the hindrance caused by the conductor to the flowing current. The work done in overcoming the hindrance to the current generates heat in that conductor

3) Tungsten is used for making filament of an electric bulb due to the following reasons: Being an alloy it has a very high melting point. It has very high resistivity so it does not burn easily at room temperature. The lamp glows at high temperatures.

4) In electronics and electrical engineering, a fuse is an electrical safety device that operates to provide overcurrent protection of an electrical circuit. Its essential component is a metal wire or strip that melts when too much current flows through it, thereby stopping or interrupting the current.

5) MCB provides a better interface with the help of knob than a fuse. In case of the fuse, the compete for handle needs to be taken care out. Handling MCB is electrically safer than handling a fuse. MCB is reusable and hence has less maintenance and replacement cost