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Basic electrical site
Principles of electricity
Principles of electricity
Voltage = V
The unit for electromotive force (emf). The higher the voltage the greater the force is to cause electrons to flow along the conductor (eg 240v for domestic).
Current = I
The ampere is the unit of current, and can be defined as the unit of quantity or volume passing down a conductor. (eg 3 amp fuse).
Resistance = R
The ohm is the unit of resistance, which opposes the flow of current.
Watts = W
It is the unit of power for an appliance. Power is used to make an appliance work; as some power is absorbed, an appliance is never 100% efficient (e.g 3kW immersion heater).
Joules = J
The unit of electrical energy. As this is so small, it is not generally used. Today it would be measured in the kilowatt hour, which is how electricity bills are measured.
The relationship between watts – amps – volts
The relationship between watts – amps – volts
To use the power triangle just cover up what you are looking for; an example may be amps; so cover up the A, the because the W is on top and the V below divide the two. If you are looking for the watts, the V&A are on the bottom these would be multiplied to give you your answer in watts.
Ohms law
Ohms law
Ohm’s Law shows the relationship between: voltage – current – resistance. In a similar manner to the power triangle.
AC (alternating current) and DC (direct current)
AC (alternating current) and DC (direct current)
What is AC and DC?
What is AC and DC?
Checks on session
Checks on session
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