To report a campus emergency

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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

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Basic Electrical Theory
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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

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Ohms Law EIxR

• 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

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Ohms Law EIxR

• 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

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Ohms Law EIxR

• ? Volts 2 amps x 10 ?
• 20 V
• 14 Volts 2 amps x ? ?
• 7 ?
• 50 Volts ? amps x 5 ?
• 10 amps

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E I x R 30 amps 10 ? ? volt
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E I x R 30 amps 10 ? ? volt
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E I x R 30 amps 10 ? ? volt
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E I x R 30 amps 10 ? ? volt
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E I x R ? amps 7 ? 14 volt
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E I x R ? amps 7 ? 14 volt
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E I x R ? amps 7 ? 14 volt
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E I x R ? amps 7 ? 14 volt
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E I x R 12 amps ? ? 6 volt
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E I x R 12 amps ? ? 6 volt
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E I x R 12 amps ? ? 6 volt
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E I x R 12 amps ? ? 6 volt
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Ohms Law EIxR

• Do first part of worksheet on simple ohms law

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Ohms Law EIxR

• As Voltage increases the current will
• increase
• As Resistance increases the current will
• decrease
• As Resistance decreases the current will
• increase

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Series Circuits

• A series circuit is a voltage dividing circuit

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• 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

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• 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

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Simple Ohms Law worksheet Part 2
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Parallel Circuit

• A parallel circuit is an amperage dividing circuit

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• 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

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Do the last page of the Simple Ohms Law worksheet

• When calculating total resistance you can use
  this formula

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Calculate Voltage and Amperage values for a
series/parallel circuit
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Cant handle the math?
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Lab 5Parallel Circuits