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Electricity. Basic Terms #1 John Jones. Ampere – rate of electrical flow (volume of electricity flowing) Sometimes referred to as amps. Voltage or electromagnetic force – a measure of electrical pressure Also abbreviated EMF or E. Resistance .

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Electricity

Electricity

Basic Terms #1

John Jones


Ampere – rate of electrical flow (volume of electricity flowing)

Sometimes referred to as amps


Voltage or electromagnetic force flowing)

– a measure of electrical pressure

Also abbreviated EMF or E


Resistance
Resistance flowing)

The opposition to the flow of electrons through a conductor – measured in Ohms


Watt flowing)

Refers to the amount of power derived from a device or the rate of doing work

Example – 100 watt light bulb

1500 watt blow dryer

Kilowatt = 1000 watts


Kilo watt hour
Kilo-watt hour flowing)

Electricity is sold by the kilowatt hour

(gasoline is sold by the gallon)

Using 1000 (kilo) watts for one hour is a KWH


Watts and horsepower
Watts and Horsepower flowing)

746 watts = one horsepower


Watts volts x amps
Watts = Volts x Amps flowing)

Sometime referred to as the West Virginia Formula.

The amount of work that can be done in a circuit is equal to the voltage in the circuit times the amps


Wva analagy
WVA Analagy flowing)

You can wash your car (do work) faster is you have a large hose with lots of pressure.

A large hose will allow for greater flow of water (flow = amps)

Pressure would be = voltage (force)


Circuit
Circuit flowing)

A controlled path for electricity to flow beginning at the source (usually a breaker), traveling to the consumer (ex. light) and back to the source.

The colored wire goes to the consumer and the white wire “comes back” to complete the circuit

Unless a complete circuit is made – the devices will not work

Breakers and switches are usually used to control the flow


National electrical code
National Electrical Code flowing)

Set of guidelines for use when designing and installing electrical service and devices


Conductor
Conductor flowing)

Substance that will allow for the flow of electricity

Most common: copper, aluminum

Best Conductor: Gold


Insulator
Insulator flowing)

Substance that does not allow for the flow of electricity

Plastic, rubber


Parallel circuit
Parallel Circuit flowing)

A circuit that has more than one way that electricity can flow.

Most common type of circuit


Series circuit
Series Circuit flowing)

Has only one pathway for electricity to follow. If there are more than one device in the circuit, the electricity must flow through one device and continue on to the next device. Not normally used in houses.

Christmas lights are sometimes wired in series. That is why if one bulb goes out the whole line goes out


W v a
W = V*A flowing)

A device (such as a light) hooked to a 120 volt circuit that is pulling 5 amps would be using how many watts?

W = 120*5

W = 600


W v a1
W = V * A flowing)

Also means that:

V = W / A (watts divided by amps)

A = W / V (watts divided by volts)


Calculating amps
Calculating Amps flowing)

Calculate the amperage of a 600 watt light bulb that is running on a 120 volt circuit.

A= 600/120 or 5 amps


Calculate voltage
Calculate Voltage flowing)

What is the voltage on a circuit that has a 600 watt bulb that is pulling 5 amps.

V = W / A

Voltage = 600/5 120 volts


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