Electric Street Railways by Edwin James Houston

By Edwin James Houston

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Example text

When open an E. M. F. acts on a broken or circuit, current it is unable to send any and will, circuit, the through therefore, do no work. Thus, when the generator at the power house is driven ELEMENTARY ELECTRIC PRINCIPLES. by an engine and supplies an E. M. 49 F. 500 volts to the trolley system connected with it, no current will pass of through the generator if there be no cars on the line, assuming that the wires are properly insulated. Under these circumstances the generator will not be supplying any power, and the engine will have no work to do except to drive the genera- In fact, except against its friction.

M. F. of 10 volts, and a resistance of 5 ohms, the current in the circuit would be -~- 2 amperes. We have seen, in connection with Fig. 3, that the quantity of water which flows per second through the water pipe from the depends both on the pressure at the reservoir, and on the resistance of the reservoir, only true when no obstacle to the flow of the water exists save pipe. This, however, is the resistance of the pipe itself. If, for example, instead of permitting the water ELECTRIC STREET RAILWAYS.

5. copper wires, having and areas of dif- cross-sec- RESISTANCE OF WIRES. are diagrammatically represented. A, represents a trolley wire 1 mile long tion, and fore, ohm. 5 a wire 2 miles long of the ELECTRIC STREET RAILWAYS. 0 ohm. 25 ohm. a wire 1 mile _/>, is mately, but having a cross-section, as represented on the left hand side, say twice that long, of of the wires, A, B, or C. 25 ohm. 65" in 2i diameter, having, therefore, four times the cross-section of A, and being 2 miles in If the wire length.

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