1. Kewell kow Copy down the following chart: QuantitySymbolEquationsStandard Metric Unit Other Units Potential Difference (aka Voltage) VV = W / q V = IR Volt (V)J / C CurrentII = q / t I = V / R Amperes (A)C /s V / Ω PowerPP = w / t Leave space Blank for now Leave space Watt (W)J / s Leave space Blank for now ResistanceRR = ρL / A R = V / I Ohm (Ω)V /A Energy (Work) WW = Vq W = Pt Joule (J)VC Ws

2. Electronvolt- eV- unit (of voltage or energy?) Impulse- J – Variable = to change in p Ampere- A – Unit of Current = coulomb/sec Resistivity- ρ – Something Else- property of matter Current- I – Variable measures charge flow Ohms- Ω – unit of resistance Resistance - Variable measures opposition to current Watt - Unit of POWER energy/time Area - Variable measures dimension k(electricity)- Something Else - Constant Joule- Unit of Work and Energy elementary charge – something else – charge on

3. Circuit Elements – Voltage Sources batterycell

4. Circuit Elements – Resistances variable resistorfixed resistor lamp

5. Circuit Elements – Switch switch

6. Circuit Elements – Measuring Devices Measures: VOLTAGE Resistance: HIGH Connect to circuit: OUTSIDE voltmeter Measures CURRENT Resistance: LOW Connect to circuit: INSIDE ammeter

7. Proper Use of Meters 5 V 2.5 Ω 0 V 2 A 5 V 0 V 2 A 5 V NEXT

8. End of 4.2.3A