《电路》（英文版）12-1 Three-phase voltages

A A--connection three-phase sources a, b, c--line ter min als

If a positive current is flowing into the(+) end of the current coil while the(+) terminal of the voltage coil is positive with respect to the unmarked end, an upscale reading is obtained

Let us add and subtract on the right side of I2 we have

the short-circuit input impedance I12=0 the short-circuit forward current gain I1V2=0 Let 1=0 he open-circuit reverse voltage gain I1=0 the open-circuit output admittance

13-6 Interconnection of two-ports 1. Series connection

13-8nic(Negative-impedance- converter(负阻抗变换器))

S14-2 Exponential Fourier series f(t)=+ cosot+a2 cos 2ot+.] sinot+ b2 sin

14-4 Line spectrum A plot showing each of harmonic amplitudes in the wave is called the line spectrum

14-6 Effective values and power The effective or rms value of the function f(t) is