1.)
Temporarily remove the resistance (called the
load resistance RL) whose current is required.
Temporarily remove the resistance (called the
load resistance RL) whose current is required.
2.)
Find the open-circuit voltage (Voc)
which appears across the two terminals from where resistance has been removed.
This is also called Thevenin voltage (Vth).
Find the open-circuit voltage (Voc)
which appears across the two terminals from where resistance has been removed.
This is also called Thevenin voltage (Vth).
3.)
Compute the resistance of the whole network as
looked into from these two terminals after all voltage sources have been
removed leaving behind their internal resistances (if any) and current sources
have been replaced by open-circuit i.e. infinite resistance. It is also called
Thevenin’s resistance (Rth).
Compute the resistance of the whole network as
looked into from these two terminals after all voltage sources have been
removed leaving behind their internal resistances (if any) and current sources
have been replaced by open-circuit i.e. infinite resistance. It is also called
Thevenin’s resistance (Rth).
4.)
Replace the entire network by a single Thevenin
source whose voltage is Vth or Voc and whose internal
resistance is Rth.
Replace the entire network by a single Thevenin
source whose voltage is Vth or Voc and whose internal
resistance is Rth.
5.)
Reconnect RL back into its terminlas
from where it was previously disconnected.
Reconnect RL back into its terminlas
from where it was previously disconnected.
6.)
Finally, calculate the current flowing through RL
by using the equation I = Vth/(Rth + RL).
Finally, calculate the current flowing through RL
by using the equation I = Vth/(Rth + RL).