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USING A DIGITAL VOLT- OHM - METER

USING A DIGITAL VOLT- OHM - METER. Automotive Technology Learning How Electricity Works. What is Electricity?. Electricity. Electricity is the flow of electrons along a conductor . Voltage. Voltage is the force that pushes the electrons along a conductor. . Amperage.

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USING A DIGITAL VOLT- OHM - METER

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  1. USING A DIGITAL VOLT- OHM - METER Automotive Technology Learning How Electricity Works

  2. What is Electricity?

  3. Electricity • Electricity is the flow of electrons along a conductor

  4. Voltage • Voltage is the force that pushes the electrons along a conductor.

  5. Amperage • Amperage is a measurement of the volumeof electron flow.

  6. Ohms • Ohms is the measurement of resistanceto the flow of electrons.

  7. Direct Current Voltage • DC VoltsV

  8. Alternating Current Voltage ~ • AC Volts V

  9. Ohms • Ohms

  10. DC Voltage • DC voltage flows in only one direction.

  11. AC Voltage • AC voltage flows back and forth.

  12. VOM Leads • Inspect VOM leads and determine how to hook up to VOM. • BLACK LEAD → Common Ground (-) • RED LEAD → Ω Volts Hz (+)

  13. VOM Battery • Determine VOM Battery Location • Inside back cover

  14. DVOM Scale • Always estimate what readings you anticipate getting and then set the meter to a value higher than what you are expecting to measure.

  15. Meters that do not have adjustable range settings are called auto-ranging.

  16. Automotive Use • What scale would you use to test the battery voltage of most cars? • 20 VDC

  17. Continuity • To test the continuity or “connectedness” of a circuit, you should use what scale? • Ohms

  18. Continuity • You should never use which scale when the power is turned on or connected to the circuit? • Ohms

  19. For instructional purposes electricity can be compared to water

  20. Car Battery • Car batteries are for storing electricity, but they do not produce it.

  21. Draw Test • Milli-amp scales can be used for what test? • Draw Test

  22. Diode • A Diode is a one way check valve for electricity.

  23. Resistance • Define the following terms in relation to resistance (ohms): • Infinity = not connected • Open = not connected or “off” • Closed = connected or “on” • Shorted = Power to ground with no load

  24. OPEN CIRCUIT VOLTAGE CHART for 12 Volt Battery • 11.80 or less….. ………….…..…0% • 12.00..………….. ……………….25% • 12.20 …………... ……………….50% • 12.40…………… ……………….75% • 12.60 or higher.. ………………100%

  25. Questions? • Vance Bloom • vbloom@hemetusd.k12.ca.us • Ed Kessel • ekessel@hemetusd.k12.ca.us

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