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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Basic Terms #1
Sometimes referred to as amps
– a measure of electrical pressure
Also abbreviated EMF or E
The opposition to the flow of electrons through a conductor – measured in Ohms
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
Electricity is sold by the kilowatt hour
(gasoline is sold by the gallon)
Using 1000 (kilo) watts for one hour is a KWH
746 watts = one horsepower
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
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)
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
Set of guidelines for use when designing and installing electrical service and devices
Substance that will allow for the flow of electricity
Most common: copper, aluminum
Best Conductor: Gold
Substance that does not allow for the flow of electricity
A circuit that has more than one way that electricity can flow.
Most common type of circuit
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
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
Also means that:
V = W / A (watts divided by amps)
A = W / V (watts divided by volts)
Calculate the amperage of a 600 watt light bulb that is running on a 120 volt circuit.
A= 600/120 or 5 amps
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