More notes

Question 1

Solenoid?

Answer 1

Is a wire wound into a coil to create a stronger magnetic field (used in voltage tester)

Question 2

Lifting magnet?

Answer 2

Use a solenoid wrapped around a piece of magnetic material having low retentivity

Question 3

Relays?

Answer 3

designed to act like switches, apply current and the spring loaded armature attracts to stationary part of relay

Question 4

Doorbells and buzzers?

Answer 4

made up of two sets of contacts, one set stays closed while other opens and closes to make the bell ding

Question 5

Motor and generators?

Answer 5

The most common use of electromagnetism.

Motors: produce mechanical energy from Electrical energy.
Generators: produce electrical energy from mechanical energy.