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20 RICHARDSON'S BLUEBOOK OF PROJECTION
form a very harmful "short" provided the resistance of the normal line is still higher.
Electrical Power
(43) The power that can be obtained from an electric current is not a matter of current strength alone, as can easily be understood by considering a current of water. Imagine a waterfall flowing 100 gallons per second from a height of 10 feet, and another fall of exactly the same volume, coming from a height of 100 feet. Obviously the second waterfall will be able to deliver 10 times as much power as the first; if its height were 200 feet it could deliver 20 times as much power. The power is clearly not a matter of current flow alone, but of pressure also, which in the case of a waterfall is height; in the case of electricity is voltage.
(44) On the other hand, consider two waterfalls of the same height, but one flowing at the rate of 1,000 gallons per second while the other is a mere trickle. The fact that the height is the same in both cases will not give both falls the same power.
(45) Similarly in electricity. A flow of 1 ampere driven by 1 volt through 1 ohm does not have the power of a flow of 1 ampere driven by 10 volts to overcome the resistance of 10 ohms. The latter has 10 times the power of the former.
(46) Electrical power is measured in watts. It is not amperage alone, nor voltage alone, but both.
(47) In a d.c. circuit, power is found by multiplying the voltage by the amperage — 1 volt x 1 ampere = 1 watt, or I x E = W.
(48) In practice it is sometimes highly convenient to use a somewhat different formula for finding power, or wattage. By Ohm's Law, I x R = E. Translating from arithmetic into English, E. and I x R, are exactly the same thing — equal to each other — so that in any formula whatever one could be substituted for the other with perfect accuracy. In the