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Figure 30-27
Water and electricity. The pressure drop over the dam
(A to B) is analogous to the voltage drop over the resistance (A to B) (e.g., light
bulb). The amount of flow (width of water) () is analogous to the current
(I). Both falling water and electrical potential can do work, as evidenced by the
use of dams to generate electricity and electricity to pump water.
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