What is the impedance if the voltage of the line is 115 volts?
Impedance, however, does not equal the sum of resistance and reactance.
The impedance of its secondary will be a quarter of this or 3,000 ohms.
The impedance of the coil I is changed by moving its adjustable core.
Impedance depends chiefly upon the frequency of alternation.
An important factor in the design ...