# Thevenin and norton theorem question

1. Apr 13, 2015

### rajeshmarndi

Why in thevenin theorem, we take the equivalent resistance in series to the load resistor, while in norton theorem we take the equivalent resistance parallel to the load resistor.

Thanks.

2. Apr 13, 2015

### Simon Bridge

Because that is what works.
Note: you can take the equivalents without having a load resistor ... think you may benefit from looking up a more general description.

3. Apr 13, 2015

### Delta²

yes because that is what it has to be in order to prove the theorems, in order for the theorems to be true. Because if for example you take in norton theorem the "equivalent" resistance in series with the "equivalent" current source and the load resistor, then you just cant prove the theorem. Which means that the supposed "equivalent" resistance and current source (as defined by the theorem) are no longer equivalent i.e the current and the voltage in the load resistor will not be the same with the "equivalent" components in series as they would be if you had the actual circuit.

Last edited: Apr 13, 2015