St. John, Thomas M. (Thomas Matthew), b. 1865 · New York, T. M. St. John · leaf 52
referring to Ohms law(Study, §356); theresistance is so great thatthe strength of the cur-rent depends entirely uponthe E. M. F. Voltmeters measureeledtrical pressure just as steam gauges measure the pressure of steam. Fig. 62 shows one form of voltmeter. Fig. 63 shows a voltmeter … 50 APPARATUS FOR ELECTRICAI, MEASUREMENTS. with illuminated dial. An eledtrical bulb behind theinstrument furnishes light so that the readings can beeasily taken. 68. Electrical Resistance. Did 30U ever ride downhill on a hand-sled ? How easily the sled glides over thesnow! What happens, though,…
Electricity
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