Electrical Generation and Transmission

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Electrical Generation and Transmission
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Generating Electricity
Can use a magnetic field to produce an electric
current Electromagnetic induction process of
generating a current by moving an electrical
conductor relative to a magnetic field
(discovered by Farraday 1831) Ex. Moving a
magnet through a solenoid creating a current
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Generators
A device that converts mechanical energy to
electrical energy Ex. Generator used in a
snowstorm Rotates a coil of wire in a magnetic
field
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Types of generators
AC Alternating current generator charges
produced flow in one direction first, then the
other direction DC Direct current generator
charges produce a direct current
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Transformers
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Transformer a device that increases or
decreases the voltage and current of two linked
AC currents How works? induces a magnetic
field in one coil which then induces an
alternating current in another coil with a
different number of turns.
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Step up transformer
increase voltage in transmission line
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Step up transformer
Goes from low number of coils on side where
voltage comes in and high number of coils where
voltage is going out
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How do you know how much voltage gets stepped up?
10 coils
5 coils
120 volts
Volts out ?
5 coils x 10 coils 120 volts
X Solve for X
Cross multiply and solve for X X 240
volts
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Step Down Transformers
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Step down transformer
Goes from high number of coils on left (high
voltage in) to a low number of coils on right
(low voltage out)
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How do you know how much voltage gets stepped
down?
20 coils
10 coils
1000 volts
Voltage out ?
20 X 10 1000 Volts X
Solve for X 20 X 10000
X 10000
20 X 500 volts
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So how does power get to your house??