Electrical installations of electric light, power, traction and industrial electrical machinery (1902)
Kennedy, Rankin, d. 1917 · Edinburgh T.C. & E.C. Jack · leaf 36
a loss of about 7 per cent, in pressure, we must not take more thansVth of an ampere from it. A cell is required to give 5 amperes with an efficiency of 90 percent, in pressure, what should its internal resistance be? Its pressurewhen no current is flowing is 1.5 volts. 10 per cent, drop on 1.5 =… … Fig. 15.—Silvertown Companys Battery of Low Resistance Cells now on the market is in the Silvertown improved low resistancebattery (Fig. 15), here illustrated and described. Its resistance is0.05, pressure 2.08 volts, current 5 amperes, so that the drop on 5amperes would be 5 x 0.05 = .25 volts, or…
Electrical engineering · Electric power
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