1. Current Electricity

2. Current A measure of the flow of charge. Ampere: Electrical measurement of the flow of electrons. 1 Ampere = 1 Coulomb/second. 1 Coulomb = 6,250,000,000,000,000,000 Electrons

3. Current Water Analogy: current is gallons per minute. Symbol for Current = I

4. Conventional Current Conventional current = positive charge flow. Electron Flow is in opposite direction

5. Current

7. Voltage The force that pushes electrons through a wire. Electrical Pressure or “Potential Difference”. Measured in Volts 1 volt = 1 joule/Coulomb

8. Voltage Water analogy: Voltage is the water pressure supplied by the pump (battery) or a water tower. The symbol for voltage = V

9. Resistance A resistor hinders the flow of current through a circuit. Ohm = unit of resistance (Ω)

10. Resistance Water analogy: a waterwheel, constriction in pipe, or other object that hinders flow. Symbol is R

11. Ohm’s Law Relates Current, Voltage, and Resistance. I = V/R Or.. R = V/I

12. Where Does Voltage Originate? V = ∆PE / q ∆PE = work done on charge. (joules/coloumb)

13. Relating Voltage to Electric Field V = ∆PE / q –Joules/coulomb E = V/d –Unit is N/C Electric field –directly proportional to applied voltage –Inversely proportional to distance between plates.