Electricity Flashcards
1
Q
What is energy measured in?
A
Joules, Wh, kWh
2
Q
What is the difference between power and energy?
A
Power is the rate at which energy is expended.
Energy is the power dissipated over a length of time.
3
Q
What is power measured in?
A
Watts
4
Q
What is current?
A
Current is the movement of charge carriers. It is measured in amps.
5
Q
What is EMF?
A
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.
6
Q
Name four ways that current is measured.
A
- 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.
7
Q
What is Ohm’s law?
A
1 volt over 1 Ohm causes 1 Amp to flow.
