EMI and its applications

In 1831 who discovered electromagnetic induction?

• Thomas Edison

• Nikola Tesla

• Michael Faraday

• Albert Einstein

The voltmeter is at 0 in this image. How would you manipulate the experiment to create electricity (measured in volts)?

• Flip the magnet around so the North pole is facing out

• Move the magnet back and forth

• Replace the voltmeter with an ammeter

• Add more coils around the paper cylinder

In electromagnetic induction, what is being created?

• Magnetism

• Electrical energy

• Mechanical energy

• Chemical energy

Tags

NGSS.HS-PS2-5

NGSS.HS-PS3-3

The period of a wave is

• the same as frequency

• time required to complete one cycle

• expressed in Hertz (Hz)

• none of the above

The period of the alternating current equals

• 1 A

• 10 ms

• 20 ms

• 20 s

The amplitude of the alternating current equals

• 1 A

• 2 A

• 10 ms

• 20 ms

The electricity in our house is

• AC

• DC

• BC

• AD

The 220V in our home mean

• Maximum value of alternating voltage

• Minimum value of alternating voltage

• Effective value of alternating voltage

• Arithmetic average of alternating voltage

This picture is an example of a ________________.

• Motor

• Generator

• Step-up transformer

• Step-down transformer

Tags

NGSS.HS-PS3-3

A transformer has 25 turns in the primary coil and 100 turns in the secondary coil. When a 120 V is applied to the primary coil, what is the voltage in the secondary coil?

• 480V

• 30V

• 100V

• 125V