AC Electricity. Our Everyday Power Source. 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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Our Everyday Power Source
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
If the primary wires and secondary wires don’t actually connect, how does the energy get from the primary circuit to the secondary circuit?!
= 170 Volts
= -170 Volts
120 VAC is a root-mean-square number: peak-to-peak is 340 Volts!