1. Ch 5 E-M notes Due Friday 11/6 Notes Friday 10/30 – 11/5

2. 1. Current producing B-field

3. 2. Terms related to Electricity termDefinitionsUnitPlumbing VoltageElectrical Pressure Volt VWater Pressure ResistanceResistance to Electron flow Ohm ΩPipe diameter CurrentFlow rateAmp. AFlow rate PowerCurrent x Voltage Watt WRate of work done

4. 3. Voltage Amount of Electrons Available to Circuit Luigi Galvani – Frogs legs Dancing with Current flowing thru P.120 As a magnet was near the legs the motion was altered According to magnet position…* Some how electricity and magnetism are connected*

5. 3. Voltage continue Volts is the unit Volta is the Scientist whom it was named after. Lead and lead oxide plates are immersed in a bath of dilute sulfuric acid. (Car battery) Lead w/acid = lead sulfate (white crud), e- Lead oxide w/acid = lead Sulfate Lead sulfate in water(Dead battery)

6. 4. Resistance – more white crud slower

7. 4. Resistance - continue Resistance is the property of copper wire the more wire you have the less resistance but the voltage decreases. Copper is the conductive material while the plastic cover is the insulator Were does the energy come from to Recharge a Battery? A source: wall, other battery, charger…

8. 4 resistance continue Low resistance copper wire – chargers and power cords High resistance copper wire – Toasters, heaters, Stove tops(electric) Franklin p. 126, Ringing bells in a lightning storm isn’t bright. Why?

9. 5. Current The flow of Electrons, e- As the current goes thru the wire magnetic field is produced

10. 5. Current continue The amount of current depends on the voltage and the resistance. High voltage low resistance fast current Low voltage high resistance slow current Ampere or Amp is the unit for current A 1 amp = 1 coulomb of charge per second

11. 6. Power Power is the amount of work the electron can do. Ohm’s law states Power is current times voltage Power units are watts so … Watt = Amp x Volt

12. 6. Power continue The amount of Resistance is dependent on the material the electricity is traveling thru High resistance abundance of Heat is produced Low resistance less

13. 7.Examples P=IV If P =3 x 10 5 watts and V=120volts find I I = P/V = 3 x 10 5 watts / 120volts I = 2.5 x 10 3 amp

14. 7.Examples continue P=IV If I =3.5 amp and V=120volts find I P = (3.5amp) (120volts ) = 420 watts P = 4.2 x 10 2 watts P= 0.42 Kw