Electricity

Question 1

What is energy measured in?

Answer 1

Joules, Wh, kWh

Question 2

What is the difference between power and energy?

Answer 2

Power is the rate at which energy is expended.

Energy is the power dissipated over a length of time.

Question 3

What is power measured in?

Answer 3

Watts

Question 4

What is current?

Answer 4

Current is the movement of charge carriers. It is measured in amps.

Question 5

What is EMF?

Answer 5

Electromotive force. It is when charge builds up of positive polarity (electron shortage) in one place and negative polarity (electron excess) in another place. A powerful electromotive force exists. It is measured in volts.

Question 6

Name four ways that current is measured.

Answer 6

• Electrons per second
• Coulombs per second
• Amperes
• 6,240,000,000,000,000,000 electrons per second
• 6.24 x 10 to the 18th power electrons per second.

Question 7

What is Ohm’s law?

Answer 7

1 volt over 1 Ohm causes 1 Amp to flow.