. The principles of physics. rned out; hence veryhigh vacua are produced in the bulbs with a mercury pump. Fig. 479 represents an Edison lamp. The loop or filamentof carbon, L, is joined at n n to two platinum wires which passthrough the -closed end of the glass tube, T. One of these wiresis connected with the brass ring, B, and the other with thebrass button, D, at the bottom of the lamp. When the lampis screwed into its socket, connection is made with the linethrough pieces of brass in the socket which are insulatedfrom each other. An Edison 16 ( lamp has a resistance (whenhot)
. The principles of physics. rned out; hence veryhigh vacua are produced in the bulbs with a mercury pump. Fig. 479 represents an Edison lamp. The loop or filamentof carbon, L, is joined at n n to two platinum wires which passthrough the -closed end of the glass tube, T. One of these wiresis connected with the brass ring, B, and the other with thebrass button, D, at the bottom of the lamp. When the lampis screwed into its socket, connection is made with the linethrough pieces of brass in the socket which are insulatedfrom each other. An Edison 16 ( lamp has a resistance (whenhot) of about 140 ohms, the difEerence of potential at itsterminals is about110 volts, and itrequires a currentof lamp con-sumes about one-tenth of a horse-power. Incandescentlamps are usuallyintroduced into the circuit in multiple arc (Eig. 480), thecurrent being equally divided by properly regulating theresistance between all the lamps in the circuit. The customer pays by the watt-hour ^ for the electric energy. Pig. 480. > A watt of electrical actirity corresponds to ^i, of mechanical aotirity;hence, if a lamp or motor take activity equivalent to 7I5 for one hour, it con-sumes one watt-hour of energy, or 3600 joules. It has been found that an incandescent lamp consuming 1000 watt-hours of elec-trical activity gives about one-tenth of the illumination given by 1000 feet of gas underordinary circumstances ; consequently, in order that the customer may pay for elec-tric light at the same proportional rate for the same illumination that he would payfor gas, the price per thousand watt-hours must be placed at one-tenth of the priceper thousand feet of gas. 592 ETHEK DYNAMICS.
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectphysics, bookyear1895
