1. the flow of charged particles charged particles ; through a conducting metal

2. Circuit a path through which current can flow through a conductor (can be series or parallel)

5. Circuit Symbols Light Bulb Battery

6. Circuit – In Series Only one path for the current to travel

7. Circuit – In Parallel More than one path for the current to travel

8. Open vs Closed Circuits Open: –Incomplete path so the current can NOT travel Closed: –Complete path allowing current to return to the battery

9. Current Electric current (I) is the movement of electric charge in a conductor. –Measured in Amps (A)

10. QuantitySymbolUnitsEquation(s) Electric Potential Difference (a.k.a. voltage) Current Power Resistance

11. Electric current (I) is measured in amperes, in honor of Andre Marie Ampere Andre Marie Ampere Andre Marie Ampere Andre Marie Ampere.

12. Ammeter a device that measures current attached in series

13. Voltage Voltage (V) (also know as Potential Difference) can be thought of as the force pushing electric charges along a conductor –Measured in Volts (V)

14. Voltage (a.k.a. electric potential difference) volt The SI unit of voltage is the volt, named in Alessandro Volta Alessandro Volta honor of Alessandro Volta. Alessandro Volta

15. Voltmeter a device that measures electric potential difference, must be connected in parallel

16. Resistance determines the amount of current flow = the ratio of voltage to current = the ratio of voltage to current R= V I The SI unit of resistance is the ohm  ohm, , named Georg Simon Ohm Georg Simon Ohm in honor of Georg Simon Ohm.Georg Simon Ohm One ohm One ohm of resistance is the resistance one volt such that one volt of voltage (potential difference) one amp is needed to obtain a current of one amp.

17. Resistance Resistance (R) is a measure of how difficult it is to push the charges along. –Measured in Ohms (  –Calculating Total Resistance for: Series: –R T = R 1 + R 2 + R 3 Parallel –1/R T = 1/R 1 + 1/R 2 + 1/R 3

18. Resistors - example

19. Resistance of a Conductor Resistance of a conductor can be affected by 3 things: 1.Material 2.Size of wire- length and diameter 3.Temperature

20. Material Some materials conduct an electrical charge better than others

21. Size of Wire The total length of the wires will affect the amount of resistance. The longer the wire, the more resistance there will be. The smaller the diameter of the wire, the more resistance there will be.

22. Temperature The resistance of a conductor increases with temperature.

24. Which circuit can have the larger current, series or parallel? Why?

25. Ohm’s Law Ohm's Law deals with the relationship between voltage and current in an ideal conductor. Ohm's Law is given by: I= V/R Current = Voltage / Resistance

26. Electric Power Electric Power (P) is the rate at which energy is transferred –Measured in Watts (W) P = IV P = I²R E = Pt

27. QuantitySymbolUnitsEquation(s) Electric Potential Difference (a.k.a. voltage) Current Power Resistance

28. Calculate the current flowing through the following circuit:

29. Now you Try! Calculate the current flowing through the following circuit:

30. Calculate the resistance of the resistor

32. Calculate the equivalent resistance of the circuit and the total current running through the circuit.

33. Your Turn! Calculate the equivalent resistance of the circuit and the total current running through the circuit.

36. Analogies of simple circuits are these links: Water circuit analogy link link