1. Chapter 17
Section 2: Current

2. D4
Explain the relationship among voltage, current and resistance in a simple series circuit.

3. Learning Target I can explain Ohm’s Law.
I can calculate voltage, current and resistance using Ohm’s Law.

4. OHMS LAW

5. What is Ohms Law?
Ohm’s Law explains the relationship between voltage (V or E), current (I) and resistance (R)
Used by electricians, automotive technicians, stereo installers, etc.

6. VOLTAGE (V)
It is the push or pressure behind current flow through a circuit, and is measured in (V) volts. 

7. CURRENT
Current refers to the quantity/volume of electrical flow. Measured in Amps (A)

8. RESISTANCE
 Resistance to the flow of the current. Measured in Ohms

9. Chart

10. General Rule.
1. Assuming the resistance does not change: As voltage increases, current increases. As voltage decreases, current decreases. 2. Assuming the voltage does not change: As resistance increases, current decreases. As resistance decreases, current increases.

11. How do we use Ohms Law?

12. V = I x R
I = V R
R = V I

13. How to calculate?
Battery voltage is 12V
Current?
Resistance 2 Ohm V V

14. How to calculate? V V Voltage is 12V Current is 4 Amps
Resistance in Ohms ? V V

15. What can we use to measure?
Multi meters/ DVOM

16. Resistors Why do we need resistors?
To decrease the amount of voltage applied to a component
The value of the resistor is marked on the body using colored rings.

17. Resistors

18. Resistor color chart

19. Learning Target Checkpoint
What is Voltage?
What is Current?
What is Resistance?
Calculations on worksheet