1. Check your Understanding
Draw a Circuit with:
The electron flow going counter clockwise
1 – light bulb
1 – Closed switch
1 – resistor
1 – battery

3. Potential Difference
Potential Difference (voltage) = The amount of electrical potential that an electron possesses between two points. Or
The amount of energy an electron possesses.
The SI unit for voltage = volt (V)

4. Measuring Voltage V
- Voltage meter

5. Drawing a Volt meter Rules: - Volt meter attaches at two points
- Attaches around a load or battery

6. 4 electrons/sec

7. Current
Current: Is the amount of electric energy (or electrons) that pass through a point in one second
Current is measured in Amperes
SI units: Amp (A)

8. Drawing a Ammeter A
Rules: - Ammeter is attached into the circuit

9. Resistance
Aluminum
Copper

10. Resistance
Resistance = The amount that a substance opposes the flow of electrons
SI units: Measured in Ohms ( )
All loads add some resistance
Resistance slows down the flow of
electrons and releases some energy
as heat

11. Hw: pg. 438 1 - 4 pg. 442 # 1 – 3 Draw 2 circuits: Circuit 1:
1 – light bulb
1 – volt meter (around the light bulb)
1 – battery
1 - resistor
Electron flow going clockwise
Circuit 2:
2 – light bulbs
1 – amp meter
1 – volt meter around the battery
1 – battery
Electron flow going counter clockwise