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<p>
This circuit shows an
inductor being driven by an AC voltage.<span style="mso-spacerun:
yes"> </span>The colors indicate power consumption; red means that
a component is consuming power, and green means that the component is
contributing power.<span style="mso-spacerun: yes"> </span>The left
side of the circuit represents the power company's side, and the right side
represents a factory (with a large induction motor).<br>
<br>
The highly inductive load is causing the power company to work a lot
harder than normal for a given amount of power delivered.</span><b><span
style="mso-spacerun: yes"> </span></b><span style='font-weight:
normal'>The graph on the left indicates the power lost in the power
company's equipment (the resistor at top left).<span style="mso-spacerun:
yes"> </span>The graph in the middle is the power delivered to the
factory.<span style="mso-spacerun: yes"> </span>The graph on the
right is the power delivered to the inductor (and then returned, causing
the time average of power delivered to be zero).<br>
<br>
Even though a peak power of 40 mW is being delivered to the factory, 200
mW is being dissipated in the power company's wires. This can
happen whenever <a href="http://hyperphysics.phy-astr.gsu.edu/hbase/electric/powfac.html">power
factor</a> is less than 1, and power companies usually charge
extra when this happens.
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Next: <a href="e-powerfactor2.html">Power Factor Correction</a><p>
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