1. Ohms law

2. (Potential Difference )
Variables
Name
Variable
S.I. Unit
Voltage
(Potential Difference ) V
volts (V)
Current I
amperes (A)
Resistance R
ohms (W)

4. YOU YOU V=IR + - Ohm’s Law What determines the voltage of a circuit?
What determines the resistance of a circuit?
YOU + -

5. A better way to think of Ohm’s LawV I = R + -

6. A better way to think of Ohm’s LawV I = R + -

7. A better way to think of Ohm’s LawV = R + -

12. GFCI

13. Circuit Breaker How prevent overload?
a device that automatically interrupts the circuit if the current exceeds a certain value or changes quickly.
Circuit Breaker

14. Fuse Box

15. Car Fuses

16. Fuse How prevent overload?
A safety device consisting of a length of wire which melts when the current exceeds a certain value.
This breaks the circuit.
Fuse