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2. Energy associated with electrical charges
Electrical Energy:
Energy associated with electrical charges
Lightning, batteries, power

3. 20 Coulombs
0.025 Coulombs

4. Electric Charge:
Causes subatomic particles to repel or attract
An excess or
shortage of electrons
SI unit is Coulomb
6.24 x 1018 electrons = 1 C

5. Electric Field:
*The effect an electric charge has on the space around it
*Strength depends
upon amount of
charge produced
and distance
from the charge

6. Ways Charges Can Be Transferred
1) Friction:
2) Contact:
3) Induction:

7. Electric Current:
Continuous flow
of electric charge

8. More charges flowing = greater current

9. Conductor: charge flows easily
Insulator: charge does not flow

10. Resistance:
opposition to electric flow
e- are colliding more so less energy is available to move through wire

11. R Resistance: The forces preventing the easy flow of electricity
SI unit: Ohm
Thickness
Length
Temperature

12. Thickness: thicker means easier to flow… less resistance
Length: longer means further to travel… more resistance
Temperature: Hot…
more e- collisions so energy for moving is lost…more resistance

13. SI unit of resistance: ohm
Super Conductor:
material that has almost
zero resistance
Hyperlink on levitation

14. Potential Difference:
Difference in electrical potential energy between 2 places because of different strengths of electrical fields

15. Voltage: The potential difference between 2 points

16. The amount of force that electricity moves through its path with
Voltage:
The amount of force that electricity moves through its path with V

17. Ohm’s Law:
V = volts
I = current
R = Resistance

18. Ohm’s Law

19. Current = I = 4 amps Resistance = 3.0 W V = IR V = 4 (3) = 12 volts
A current is 4 amps with a resistance of 3.0 ohms. Calculate the voltage of the current.
Current = I = 4 amps
Resistance = 3.0 W
V = IR
V = 4 (3) = 12 volts