1. BASIC ELECTRICITY n VOLTAGE n AMPERAGE n OHMS Page 242Autobody Text

2. SERIES CIRCUIT RULES n The current through each resistance is the same. n The sum of individual voltage drops is equal to the source voltage n The total circuit resistance is equal to the sum of the individual resistance's Chap 1 Handout - Page 9

3. PARALLEL CIRCUIT RULES n The sum of the branch circuit currents is equal to the total circuit current n The voltage drop across each branch circuit is the same n The current in each branch circuit is different if the resistance values are different. Chap 1 Handout - Page 10

4. PARALLEL CIRCUIT RULES CONT’D n The total circuit resistance (equivalent resistance) is less than the value of the lowest resistance. n The equivalent resistance for two resistance's in parallel is equal to the product divided by the sum Chap 1 Handout - Page 10

5. Ohm’s Law V = AxR V = IxR V = IxO All the same V A x R Chap 1 Handout - Page 8

6. COMMON CIRCUIT FAILURES -OPEN CIRCUIT -GROUNDED CIRCUIT -SHORT CIRCUIT -POOR CONNECTIONS Autobody Text - Page 242

7. DIAGNOSTIC EQUIPMENT

8. DIGITAL VOLT- OHMMETER -10 MEG OHM IMPEDANCE -DIGITAL READOUT VERY PRECISE -MULTI-METER (MULTI-USES) -DIODE TESTER -AUDIBLE CONTINUITY TESTER -OVERRANGE INDICATOR Autobody Text - Page 243

9. DVOM VOLTAGE TESTS -Power Switch -Polarity -Start with highest range and turn down range until most accurate reading -Over-range indicator -Low battery -Hook across (parallel) device or circuit being tested Autobody Text - Page 244

10. DVOM AMPERAGE TESTS -Fuse Protection -Hook in series with circuit -Function selector adjust to most accurate range -Maximum amperage of meter

11. DVOM OHMMETER TESTS -Isolate component to be tested -fuse protected -Function selector to most accurate range Autobody Text - Page 244

12. TEST CONNECTIONS

13. Reading the DVOM Handout

14. TEST LIGHTS n NON POWERED LIGHT -TELLS PRESENCE OF VOLTAGE -EASY AND QUICK TO USE -LOW INTERNAL IMPEDANCE n SELF POWERED LIGHT (CONTINUITY TESTER) -WORKS LIKE OHMMETER -LOW COST Autobody Text - Page 245

15. LOGIC PROBE n TELLS PRESENCE OF VOLTAGE n TELLS PRESENCE OF GROUND (LOW VOLTAGE) n WILL NOT HURT COMPUTER CIRCUITS n LIGHT AND AUDIBLE TYPE

16. JUMPER WIRES n USED FOR TEST PURPOSES n ABOUT 6”, 12” 3 FT, AND 15 FT. n LARGE ENOUGH GAUGE n DIFFERENT TERMINAL ENDS n ALLIGATOR CLIPS