By Terrell Croft, Clifford C. Carr

This bestselling reference has been the undisputed general in its box on account that 1913. each portion of the instruction manual has been completely up-to-date with such very important revisions as up-to-date codes, advances in stable nation know-how, new info on cars, and lately constructed instruments, gear, and different items on hand from brands.

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Extra info for American Electricians' Handbook

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Therefore the torque at any point is equal to the torque at any other point. The torque that must be exerted at the handle of the windlass to raise the weight at a uniform rate of speed would have to be equal to the torque exerted by the weight. ) The force exerted on the handle will be 50⁄2 ϭ 25 lb. The motor of Fig. 7 is equipped with a pulley on the shaft for driving a belt. The pulley has a diameter of 6 in. The force exerted upon the belt (the tension of the belt) is determined in the following manner.

Thus, the area of a rectangle 1⁄2 in wide and 2 in long would be 500 ϫ 2000 ϭ 1 million mils2. In actual area, a circular mil is about 8⁄10 as great as a square mil. 93. To reduce square mils or square inches to circular mils, or the reverse, apply one of the following formulas. 0000007854 EXAMPLE (21) The sectional area of the busbar in Fig. 0000007854 ϭ 955,000 cmil EXAMPLE The sectional area of the steel T shown in Fig. 0000007854 ϭ 674,800 cmil 94. The circular mil-foot (cmil⅐ft) is the unit conductor.

All three of the circuit characteristics, resistance, inductance, and capacitance, may affect the value of the current in an ac circuit. 121. Resistance of ac circuits. As mentioned in Sec. 90, the resistance of a circuit to alternating current may be considerably different from its resistance to direct current. This increase in the resistance may be due to two factors. One factor, which takes place inside the conductors, is called skin effect and is discussed in the following sections. The other factor is due to the proximity of magnetic and electrical conducting material to the circuit.

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