1. Voltage and Power

2. Conductors have “Free Electrons”

3. Free electrons flowing = Current+ -

4. Electrical Current
It is the flow of charge (the “charge” is most often electrons).
It is measured by the rate at which electric charge flows. (i.e. how fast the charges flow)
Remember: C of charge = 6.25 x 1018 electrons

5. Current I = current (measured in __________)
q = charge (measured in ________)
t = time
The current, I, is the amount of charge, q, passing a point per second.

6. Conventional Current vs. Flow of Electrons

8. What is an ‘electric circuit’?

9. It is an Energy Delivery System!!!

11. Voltage
The charge flowing around the circuit are “energy carriers” (delivery guys)
They carry electrical energy, which comes from the battery (or voltage supply).
Voltage is the amount of energy in one coulomb of charge.

12. V = voltage (measured in _______)
Ep = electrical energy (measured in ______)
q = charge (measured in ______)

13. How much energy is the light bulb receiving every second?

14. Power Power is “the amount of energy transformed per second”
“the rate of transformation of energy”
Power is “the amount of energy transformed per second”
Example: A 100 W light bulb transforms 100 J of electrical energy every second (into light and heat energy).

15. P = power (unit: _________)
I = current (unit: _________)
V = voltage (unit: _________)

16. Power = Energy / Time

17. Worksheet THREE Q1, 2, 3, 4