AC Electricity. Why AC? Distribution. long transmission line. home appliance. power plant. Getting Power to Our Homes. Let’s power our homes with DC power DC means direct current: just like what batteries deliver But want power plants far from home
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long transmission line
power plantGetting Power to Our Homes
on Colorado River
I = 120 Watts/12 kV = 0.01 Amps for one bulb, giving
P = I2R = (0.01)220 = 2010-4 Watts, so
P = 0.002 Watts of power dissipated in transmission line
Efficiency in this case is e = 120 Watts/120.004 = 99.996%
step-up to 500,000 V
back to 5,000 V
step-down to 120 V
High Voltage Transmission Lines
Low Voltage to Consumers
three-phase “live” wires
500,000 230,000 138,000 69,000 7–13,000
long-distance neighborhoodTransmission structures
looks just like
If the primary wires and secondary wires don’t actually connect, how does the energy get from the primary circuit to the secondary circuit?!
transformers usually heavy due to iron core
= 170 Volts
= -170 Volts
120 VAC is a root-mean-square number: peak-to-peak is 340 Volts!