1) Fill in the blanks with appropriate answer:
1) Electric bell is based on the principle of______
2)
_______is commonly used switch that automatically stop the current in a
circuit.
3) When an electric current passes through the wire,_______
behave like a
magnet.
4)____is a device used to measure the amount of electric current
flowing through circuit.
Answers
1)
A bell works with the principle of working of electromagnetism. When the switch is pushed on, the circuit gets completed and the current starts flowing through the U-shaped electromagnet which creates a magnetic field in the core. This attracts the iron armature.
2) Miniature circuit breaker is a switch that automatically stops the current in a circuit if the current in it exceeds the specified maximum limit
3) When an electric current flows through a wire, it behaves like a magnet. „ A current carrying coil of an insulated wire wrapped around a piece of iron is called an electromagnet. The electromagnets are also used to separate magnetic material from the junk.
4) An ammeter (from ampere meter) is a measuring instrument used to measure the current in a circuit. Electric currents are measured in amperes (A), hence the name. The ammeter is usually connected in series with the circuit in which the current is to be measured.