Cyclopedia of applied electricity : a general reference work on direct-current generators and motors, storage batteries, electrochemistry, welding, electric wiring, meters, electric lighting, electric railways, power stations, switchboards, power transmission, alternating-current machinery, telegraphy, etc. (1916)
American Technical Society · Chicago : American Technical Society · leaf 163
—that is, of a circleof one foot radius—and the torque. Remembering that 1 horse-power is 33,000 feet-pounds per minute, we have , 588X2X3.1416X406.5 ,_ _^•^•P- = 337)00 = ^^-^ (d) The electrical power input in watts is the product of voltsand amperes, or watts = 500X 80=40,000. As 746 watts equal… … ELECTRIC RAILWAYS 43 TABLE IMotor Efficiencies for Different Tracic Grades Grade Trac-tiveEffort PERMOTOK Torque Current Speed Efficiency R.P. M. M. p. H. 1 per cent 2 per cent 3 per cent5 per cent 10 per cent 400 600 800 1200 2200 135.8201.6271.0406.5746.0 40.050.060.580.0128.0 829737673588497…
Electrical engineering
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