18-6 Electric Power P=Power=energy transformed/time=QV/t P=IV=I(IR)=I 2 R=(V/R)V=V 2 /R See Example...

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18-6 Electric Power •P=Power=energy transformed/time=QV/t •P=IV=I(IR)=I 2 R=(V/R)V=V 2 /R •See Example 18-7 p 539 •See Example 18-8 p539 •See Example 18-9 p539

Transcript of 18-6 Electric Power P=Power=energy transformed/time=QV/t P=IV=I(IR)=I 2 R=(V/R)V=V 2 /R See Example...

Page 1: 18-6 Electric Power P=Power=energy transformed/time=QV/t P=IV=I(IR)=I 2 R=(V/R)V=V 2 /R See Example 18-7 p 539 See Example 18-8 p539 See Example 18-9 p539.

18-6 Electric Power•P=Power=energy transformed/time=QV/t•P=IV=I(IR)=I2R=(V/R)V=V2 /R•See Example 18-7 p 539•See Example 18-8 p539•See Example 18-9 p539

Page 2: 18-6 Electric Power P=Power=energy transformed/time=QV/t P=IV=I(IR)=I 2 R=(V/R)V=V 2 /R See Example 18-7 p 539 See Example 18-8 p539 See Example 18-9 p539.

18-7 Power in Household Circuits

• Amperage is added in a series of household products.

• Power is carried in a low amperage and high voltage because of the I2 R =IV paradox.

• Voltage is constant for each appliance, but amps are summed.

• See Example 18-10 p541

Page 3: 18-6 Electric Power P=Power=energy transformed/time=QV/t P=IV=I(IR)=I 2 R=(V/R)V=V 2 /R See Example 18-7 p 539 See Example 18-8 p539 See Example 18-9 p539.

18-8 AC current

• So far we have talked about batteries, which produce a steady flow, like a river…

• AC current produces current that moves forward and then back again like the waves at a shoreline. See page 542

• AC current can be produced by an AC generator so that it has a –I and +I in a sine-wave form.

Page 4: 18-6 Electric Power P=Power=energy transformed/time=QV/t P=IV=I(IR)=I 2 R=(V/R)V=V 2 /R See Example 18-7 p 539 See Example 18-8 p539 See Example 18-9 p539.

AC cont’d

• I=V/R=(Vo /R)(sin2pft)=Iosin2pft

• P=I2 R= I2osin22pft

• Rms means root mean square…they are not really averages, but are the effective values.

• Irms = See pg 543• See example 18-11 and 18-12 p543 and 544.

Page 5: 18-6 Electric Power P=Power=energy transformed/time=QV/t P=IV=I(IR)=I 2 R=(V/R)V=V 2 /R See Example 18-7 p 539 See Example 18-8 p539 See Example 18-9 p539.

HOMEWORK• P552 23-29, 33-37,40-44 , 47,51-52 DUE BOP

Monday.• Test Tuesday chapter 18.• Packets due WEDNESDAY!!!!


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