What is a fuse ? Write two uses of electromagnet ? What is MCB ? Name two factors on which the strength of an electromagnet depends ? Define an electric circuit ? Define average speed . Write its SI unit
Answers
Fuse is a safety device made up of tin which completes an electric circuit. If the current is higher than the specified value then the fuse melts and breaks the circuit.
Electromagnet are used for manufacture of permanent magnets and in magnetic levitation technologies like Maglev : world's fastest train.
Miniature circuit breaker is also a safety device like a fuse but the difference is that a fuse is use and throw whereas a MCB is reusable.
Strength of an electromagnet depends upon the current and it's length.
An electric circuit is a the connection between a battery's or any sort of power supply sources' positive and negative terminals using wires along with electrical components which when closed is the path taken by the electrons to flow from the -T to the +T.
Average speed is the average of different instantaneous speeds of an object during a given time interval. It's SI unit is the same m/s.