When is electric circuit's power transmitted most effectively?

JK222

Joined Feb 25, 2009
2
Hello I'm sure this is an easy question, however I'm pretty new to physics so I'm asking you.. ... When is electric circuit's power transmitted most effectively?

Thanks!

KL7AJ

Joined Nov 4, 2008
2,208
This occurs when the load impedance is the complex conjugate of the source impedance. This is true whether the circuit is DC, in which case the load and source will be simple resistances, or a complex Radio frequency system, with many impedance matching networks between source and load.

eric

JK222

Joined Feb 25, 2009
2
Thanks for the answer, Eric, though this bit of it confused me a little:

This occurs when the load impedance is the complex conjugate of the source impedance.
^ Does this mean is lower than or possibly equals? Sorry, I'm really new to this. mik3

Joined Feb 4, 2008
4,846
It is from complex numbers terminology.

A complex number

x=a+jb

has a conjugate of

x*=a-jb

For the case of the impedance this means it has equal magnitude but opposite reactance.