1. 8/9/2011 Revision02 1 Time for some calculations

2. Not by accident, but by good planning the values or sizes of the: volt amp ohm are just right for the following. A voltage of 1v will cause a current of 1a to flow through a resistor of 1w. 8/9/2011 Revision02 2 Ohm’s law

3. POINTS The current is proportional to voltage. They both go up together They both go down together The current is inversely proportional to resistance. When one goes up the other goes down and, vice versa. Let’s wire a circuit. 8/9/2011 Revision02 3 Ohm’s law continued

4. Calculations V = IR V = Voltage in volts I = Current in amps R = Resistance in ohms 8/9/2011 Revision02 4

5. I is inversely proportional to R 8/9/2011 Revision02 5 I is proportional to V

6. 8/9/2011 Revision02 6 Something like this:

7. To Calculate I Write the formula I = I = Answer = 12A 8/9/2011 Revision02 7 V R 120 10

8. To Calculate V V = IR = 6 x 6 Answer = 36V 8/9/2011 Revision02 8

9. To calculate R Answer = 5W 8/9/2011 Revision02 9