Reed Switch Quiz

Complete the sentence. A reed switch is ______ operated switch. It contains a pair of ______ strips in a sealed ______ tube.

• a magnetically

• a mechanically

• an electrically

• metal

• glass

The picture shows a permanent magnet held alongside a reed switch. In order for the switch to operate, which end of the magnet must be the north pole?

• End A

• End B

• It doesn't matter

Study this diagram of a circuit constructed using Electronics Study Trainer and Electromagnetism Card. Use the information to complete the following sentence. The lamp will glow brightly when a magnet is placed [ close to | far away from ] the reed switch and the variable supply Vs is set to [ maximum | minimum ] voltage.

What is contained inside the case of a typical relay? Choose all the correct answers.

• A coil

• A permanent magnet

• One or more sets of contacts

• A power supply

• A lamp

Study this diagram of a circuit constructed using Electronics Study Trainer and Electromagnetism Card. Identify the conditions that are required to light the lamp.