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

To report a medical emergency or fire Tell the attending instructor If very serious do not hesitate to call and stay on the line

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 is called (from a safe location)

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

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

Basic Electrical Theory

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

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

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

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

E = I x R 30 amps 10  ? volt

E = I x R ? amps 7  14 volt

E = I x R 12 amps ?  6 volt

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

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

Series Circuits A series circuit is a voltage dividing circuit

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

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

Simple Ohm’s Law worksheet Part 2

Parallel Circuit A parallel circuit is an amperage dividing circuit

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

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

Calculate Voltage and Amperage values for a series/parallel circuit

Can’t handle the math?

Lab 5 Parallel Circuits