Question

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.​

Answer 1

Answer:

1. electromagnet

2. Key

3. electromagnet