# Download Basic Electrotechnology by R. A. Ashen PDF By R. A. Ashen

ISBN-10: 040801251X

ISBN-13: 9780408012515

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Extra info for Basic Electrotechnology

Example text

M o r e advanced computer languages contain a four-quadrant version of the function, which would considerably simplify the resulting program. 30) where p is resistivity at T°C, pQis the value at 0°C, and a is a constant termed the temperature coefficient of resistance. 62 x 10" , 1 . 47 x 1 0 " Qm respectively. 0040/°C. Write a program to calculate resistance, voltage d r o p and power loss variation with temperature between 20°C and 100°C for round wire of each material carrying a specified direct current.

Since it is a product of voltage and current, but does not represent power, it is given the special unit, var, which indicates 'volt-ampere-reactive'. The quantity VI is called the apparent power, but again it is not true power and so it is given another 2 unit, 2 VA, 2 and the symbol S. c. 12(b), may be drawn relating mean power, apparent power, and reactive power. It is useful to give a sign to reactive power to indicate whether current is lagging or leading voltage. The convention adopted is that the sign of Q is the same as the sign of the reactance producing it.

This is caused by inductance and capacitance, since inductance prevents current from instantaneously attaining its steady-state value, and capacitance similarly constrains the voltage. c. sources, which implies that inductances act as short-circuits ( K L= 0), 42 Linear electric circuits and capacitors as open-circuits (/ c = 0). c. circuit has all voltages and currents varying periodically at the supply frequency. General circuit operation is represented by differential equations, and in mathematical terms, the steady-state solution corresponds to the particular integral, and the transient solution corresponds to the complementary function, o b tained by setting the forcing functions (sources) to zero.