1. Electricity (Lesson 2)

2. An atmospheric discharge of electricity
Lightning

4. --
Lightning +

5. Applications of Grounding
Grounding strips on cars/trucks
Grounding wires on workers who make computers, electronics
Applications of Grounding

6. Difference between static and current?
Electricity

7. Electric current: the controlled movement or flow of electric charge (electrons)
Current Electricity

8. We know that electrons can move. How can we get them to move?
Current Electricity

9. Electrical Conductors
Types of materials that are good conductors:
metals
salts
graphite
Electrical Conductors

10. a connection of electric components that an electric charge can flow along (a closed path)
Electric Circuit

11. Let’s use a flashlight as an example

12. Parts of a circuit:
Source
Switch
Conductor
Load
Electric Circuits

13. Circuit Example

14. Where electric current is generated
Source

15. Control mechanism in circuit (ON / OFF)
Switch

16. Item within the circuit that uses the electricity to do work
Load

17. Material used in a circuit that allows the flow of electric current
Conductor

18. Current Measured in the conductor of the circuit
Current is the rate at which charge is flowing across a point
Current is measured in units called Amperes (A)
Current

19. The measure of an opposition to a circuit provided by a load
Resistance is a material’s tendency to resist the flow of charge
Resistance is measured in units called Ohms (W)
Resistance

20. a measure of the amount of electric charge passing a point in a measure of time
Ampere

21. Amount of charge in a circuit 1 C = 6.241 * 1018 electrons
Coloumb (C)

22. How to calculate Current
Current (A) = Charge (C) Time (s)
How to calculate Current

23. Voltage The force moving the electrons to flow is Voltage
Voltage is the difference in charge between two points
Voltage is measured in a unit called Volts (V)
Voltage

24. How to Calculate Voltage
Ohm’s Law
V = I x R
Try Problems
How to Calculate Voltage

25. Power is the rate, per unit time, that electrical energy is transferred in an electrical circuit
Power is measured in units of Watts (W)
Power

26. Power Equation
P = V x I
Try Problems
How to Calculate Power

27. All values can be found with two others

28. Circuit Diagrams

29. Circuit Diagrams

30. Circuit Diagrams