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Watt. World English Historical Dictionary

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Watt. World English Historical Dictionary Dictionary Biographies Literary Criticism Welcome Terms of Service ⧏ Previous Next ⧐ Contents Slice Contents Key Bibliographic Record Murray’s New English Dictionary. 1928, rev. 2024. Watt Physics. [f. name of James Watt (1736–1819), the inventor of the modern steam-engine, and a pioneer in the science of energy.] A unit of activity or power (used chiefly with reference to electricity), corresponding to 107 ergs of work per second, to the rate of work represented by a current of one ampere under the pressure of one volt, or to 1/746 (= 0.00134) English horse-power.

1 1882.  Siemens, in Rep. Brit. Assoc., Presid. Addr. 6. The other unit I would suggest adding to the list is that of power. The power conveyed by a current of an Ampère through the difference of potential of a Volt is the unit consistent with the practical system. It might be appropriately called a Watt, in honour of … James Watt…. A Watt, then, expresses the rate of an Ampère multiplied by a Volt, whilst a horsepower is 746 Watts, and a Cheval de Vapeur 735.

2 1882.  Athenæum, 2 Sept., 310/2. Two of his [Dr. Siemens’s] units were unanimously approved—namely, (1) the watt, which is the rate of doing work when a current of one ampere passes through a resistance of one ohm, [etc.].

3 1886.  Thurston, in Jrnl. Frankl. Inst., Oct., 265. It was judged that it might have been driven up to 300,000 watts with safety.

4 1887.  Rep. Brit. Assoc., 208. The Watt is defined to be the work done per second by the ampère passing between two points between which the difference of electrical potential is one volt.

5 1889.  Telegr. Jrnl. & Electr. Rev., 13 Dec., 665/2. The A type of Sunbeam lamp required only 2 watts per candle-power as compared with 31/2 watts for the Edison-Swann lamp.

6   b.  Comb.: watt-hour, the work done by one watt in one hour; wattmeter, an instrument for measuring electric energy.

7 1887.  Ayrton, Pract. Electr., 444. By the employment, however, of a ‘wattmeter,’ it is possible to measure the watts directly.

8 1888.  Pall Mall Gaz., 24 Jan., 11/2. With 4,500 lamps of 16 candle-power,… at a charge of 1/2d. per lamp per hour, or eightpence per Board of Trade unit of 1,000 Watt hours … the income would be £11,250, irrespective of [etc.].

9 1892.  J. Swinburne, in Min. Proc. Inst. Civ. Engin., CX. 15. The ordinary wattmeter as used in continuous-current work consists of a fixed and movable coil.

10 1907.  E. Wilson & Lydall, Electr. Traction, I. 379. This can be converted into watt hours per ton mile thus.

11 1907.  Athenæum, 20 July, 74/3. Mr. J. T. Irwin gave a demonstration of the uses of his hot-wire oscillographs and hot-wire wattmeters.

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