The basic Electricity, for electrical engineer, contain information about : The schematic shows the symbols for the dry cell, switch and lamp. The following table shows the standard circuit symbols used in industry. A practical circuit has at least four components: (1) power source (battery); (2) conductors (wires); (3) load (resistors/lamp/bell); (4) means of control (switch). Horsepower The electrical energy supplied to a motor is measured in watts. The mechanical power delivered by a motor is measured in ‘horsepower’ (hp). One horsepower is equivalent to 746 W of electrical power. For most calculations, 1 hp= 750 W=3/4 kW. hp=(1000xkW)/750=4/3x kW kW=(750xhp)/1000 = 3/4 x hp Electric energy Energy and work are expressed in the same unit: Joules Power is the ‘rate of doing work’.
The kilowatt hour (kWh) is a unit used for large amounts of electric energy or work. The amount of kilowatthours is calculated as the product of the power in kilowatts (kW) and the time in hours (h) during which the power is used.
Tags : load resistors, kilowatt hour, basic electricity, hp 750, circuit symbols, kilowatthours, electrical engineer, electric energy, battery 2, dry cell, control switch, kilowatts, schematic diagram, mechanical power, energy energy
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August 14th, 2008 at 3:53 pm
very nice