Download Electrical Applications 2 by David W. Tyler (Auth.) PDF

By David W. Tyler (Auth.)

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The spacing between the conductors is the same as that for the contacts in the edge connectors. Cables with 50 or even more conductors are available. 11 MATERIALS USED IN ELECTRONIC CIRCUITS Because of its good conductivity and mechanical strength copper is used extensively to connect electronic components either in the form of insulated stranded wires or strip bonded to an insulating board in the form of a printed circuit. The insulation used is of polythene, polystyrene, polyurethane enamel or air where conductors can be suitably spaced.

The plug and socket for connection of domestic electrical equipment is an example of such a system. CONDUCTOR SCREENING AND COAXIAL CABLE A conductor carrying current sets up a magnetic field around it, the strength of which is proportional to that current. This magnetic field may affect other circuits in its vicinity and to prevent this circuit screening is necessary. Where a component is to be screened from a steady magnetic field it is surrounded with a material with low magnetic reluctance.

5 p/kWh. 0004 p/kWh in the appropriate direction for every penny the fuel cost changes from £25/tonne. Calcu­ late the cost per kWh when the fuel charges (a) fall to £20/ tonne and (b) rise to £26/tonne. 9 During eight successive half hours the energy meter con­ nected to the supply lines to a commercial premises was noted to make the following advances: 100, 150, 125, 175, 200, 150,125 and 130 kWh respectively. Assuming that these are the highest noted during the year, determine the maximum demand charge on a tariff of £20/kW of maximum demand.

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