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Alberta Electricity Industry and ENMAX
Electricity 101
  Electricity 101
How is Electricity Transmitted?

Electricity often must travel long distances from generation plants to your home, school or business. Our cities, towns, Alberta and the entire country are criss-crossed with power lines that "carry" the electricity to you.

When electricity comes out of the generation plant it usually has a voltage of about 25,000 volts. A volt is the measurement of how much electric force is pushing electrons around a circuit.

At the generation plant, the electricity is boosted up to 400,000 volts by a transformer. This higher voltage helps the electricity travel more efficiently long distances.

The electricity then goes into long thick cables called transmission lines. The wires are made of copper and aluminum because these metals let electricity flow through them easily. You can tell you are looking at transmission lines when you see high towers – often made of steel - with many wires attached to them going across the countryside.

When the electricity on the transmission lines gets close to where it will be used it goes into a substation. The substation contains electrical equipment such as transformers. The transformers lower the voltage of the electricity to the level needed depending on its use. Factories, mass transit systems, streetlights, businesses and homes all need the electricity to be at a different voltage depending on how the electricity is used.

The electricity leaves the substation to go to electricity users on smaller wires than the transmission lines. These wires are called distribution lines. In some communities, the distribution lines are overhead and you can see them. Newer neighborhoods have the distribution lines underground so you may not even know they are there.

When the distribution wires reach your neighborhood, another small transformer, mounted on a pole or in a utility box, lowers the voltage of the electricity even more so it can be used in your house. The voltage is eventually reduced to 220 volts for larger appliances, like stoves and clothes dryers, and 120 volts for lights, televisions and other smaller appliances.

When electricity enters your home, it must pass through a meter. A utility company worker reads the meter so the company will know how much electricity you used and can bill you for the cost.

After being metered, the electricity goes through a fuse box into your home. The fuse box protects the house in case of problems. When a fuse (or a circuit breaker) "blows" or "trips" something is wrong with an appliance or something was short- circuited.


More Electricity 101
What is Electricity?
How is Electricity Transmitted?
How is Electricity Made?
Electric and Magnetic Fields

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