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American Electricians' Handbook by Terrell Croft, Clifford C. Carr

By Terrell Croft, Clifford C. Carr

This bestselling reference has been the undisputed usual in its box due to the fact that 1913. each portion of the guide has been completely up-to-date with such very important revisions as up-to-date codes, advances in reliable country know-how, new details on automobiles, and lately built instruments, gear, and different items on hand from brands.

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Such a magnet is called an electromagnet. This is the method always employed for producing strong magnets or setting up strong magnetic fields. A coil of wire carrying current will act like a magnet and will produce a magnetic north pole at one end and a magnetic south pole at the other (see Fig. 20). The direction of the magnetic field produced will be from the north-pole end around through the space outside of the coil to the south-pole end and then back through the interior of the coil to the north-pole end.

3. Thomson effect. When the temperature along a metallic conductor varies in magnitude, a very small emf is produced. EMFs produced by chemical action. Certain combinations of chemicals will generate emf’s. For instance, if a piece of zinc (Fig. 14). and a piece of carbon are immersed in a solution of sal ammoniac, an emf will be produced between the zinc and the carbon. Such a combination is called a battery. If the key in Fig. 14 is closed, an electric current will flow and the bell will ring.

65. Efficiency ϭ output input (12) Although efficiency is basically a decimal quantity and is so used in making calculations, it is usually expressed as a percentage. Percentage efficiency is equal to the decimal expression of efficiency multiplied by 100. 80 expressed as a decimal is an efficiency of 80 percent expressed as a percentage. Basically efficiency deals with energy. However, when the rate of energy conversion is constant, the values of output and input in terms of power may be used in dealing with efficiency: Input ϭ and output efficiency Output ϭ input ϫ efficiency (13) (14) When the formulas are used, output and input must be expressed in the same units and efficiency as a decimal.

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