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To report a campus emergency

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  1. To report a campus emergency • Tell the attending instructor • If not available or practical call 4440 and explain the situation to campus security

  2. To report a medical emergency or fire • Tell the attending instructor • If very serious do not hesitate to call 9911 • 9- 911and stay on the line

  3. First step to dealing with a fire • Insure those in the shop are immediately aware of the fire • Additional Fire Safety • Do not hesitate to evacuate the building • If out of control make sure 9-911 is called • (from a safe location)

  4. Before using any new tool or piece of equipment • Read the instructions and service procedures • Ask questions • DO NOT use any piece of equipment at Linn-Benton Community College until you have been checked out by an instructor

  5. Before testing or diagnosing any unfamiliar machine or system • Locate and read manufacturer procedures • Pay special attention to any precautions • Ask Questions before proceeding

  6. Basic Electrical Theory

  7. For Electrical Current to Flow: • There must be a difference in electrical potential or pressure called...VOLTAGE • A conductor for the amps to move through • and Resistance to control the flow of electrons

  8. Ohms Law E=IxR • Voltage (Electromotive-force) is used up… • to push Amperage (the Intensity of the current)… • through a Resistance • Increasing resistance will lower amp flow • How will Increasing voltage affect the amp flow? • Increase

  9. Ohms Law E=IxR • 1 volt can push 1 amp through 1  of resistance • 12 volts can push 12 amps through 1  of resistance • 12 volts can push 1 amp through 12  of resistance

  10. Ohms Law E=IxR • ? Volts = 2 amps x 10  • 20 V • 14 Volts = 2 amps x ?  • 7  • 50 Volts = ? amps x 5  • 10 amps

  11. E = I x R 30 amps 10  ? volt

  12. E = I x R 30 amps 10  ? volt

  13. E = I x R 30 amps 10  ? volt

  14. E = I x R 30 amps 10  ? volt

  15. E = I x R ? amps 7  14 volt

  16. E = I x R ? amps 7  14 volt

  17. E = I x R ? amps 7  14 volt

  18. E = I x R ? amps 7  14 volt

  19. E = I x R 12 amps ?  6 volt

  20. E = I x R 12 amps ?  6 volt

  21. E = I x R 12 amps ?  6 volt

  22. E = I x R 12 amps ?  6 volt

  23. Ohms Law E=IxR • Do first part of worksheet on simple ohms law

  24. Ohms Law E=IxR • As Voltage increases the current will… • …increase • As Resistance increases the current will… • …decrease • As Resistance decreases the current will… • …increase

  25. Series Circuits • A series circuit is a voltage dividing circuit

  26. Amp flow is determined by the TOTAL resistance • All amps flow through every resistor (when in series) • As amps flow through a resistor Voltage (pressure) is used up……(voltage drop) • The sum of the individual voltage drops equal the source voltage

  27. What is the total resistance? • 6 ohms • How many amps flow through R1? • 2 amps • What is the Volt drop across R1? • 4 volt • How many volts at the connection between R1 & R2 • 8 volt

  28. Simple Ohm’s Law worksheet Part 2

  29. Parallel Circuit • A parallel circuit is an amperage dividing circuit

  30. Equal voltage will drop across each resistor in a parallel circuit • Amperage flow will vary for each resistor • The sum of the amp flow through each resistor will equal the total amp flow out of the battery

  31. Do the last page of the Simple Ohms Law worksheet • When calculating total resistance you can use this formula

  32. Calculate Voltage and Amperage values for a series/parallel circuit

  33. Can’t handle the math?

  34. Lab 5Parallel Circuits