Since no ideal sources of either variety exist ( all real-world examples have finite and non-zero source impedance ), any current source can be considered as a voltage source with the " same " source impedance and vice versa.
32.
In radio frequency transmission lines, and other electronics, there is often a requirement to match the source impedance ( at the transmitter ) to the load impedance ( such as an antenna ) to avoid reflections in the transmission line that could negatively impact the transmitter.
33.
For amplifiers, this source impedance Z _ \ mathrm { source } ( also : output impedance ) is generally smaller than 0.1 ohm ( ? ), and from the point of view of the driver voice coil, is a near short-circuit.
34.
P source, max may only be obtained from the source when the load impedance connected to it ( i . e . the equivalent input impedance of the two-port network ) is the complex conjugate of the source impedance, a consequence of the maximum power theorem.
35.
This change would be due to the source impedance ( in this DC case, the source resistance ) of the battery, power supply, or generator plus the resistance of the power system and conductors connecting it to the motor, assuming that there is no voltage regulation at work to increase and decrease the supply voltage.
36.
In this diagram, AC power is being transferred from the source, with phasor magnitude voltage | V _ \ mathrm { S } | ( peak voltage ) and fixed source impedance Z _ \ mathrm { S }, to a load with impedance Z _ \ mathrm { L }, resulting in a phasor magnitude current | I | . | I | is simply the source voltage divided by the total circuit impedance:
37.
For instance, if there is a perfect match between the load impedance " Z " load and the source impedance " Z " source = " Z " * load, that perfect match will remain if the source and load are connected through a transmission line with an electrical length of one half wavelength ( or a multiple of one half wavelengths ) using a transmission line of " any " characteristic impedance " Z " 0.
