The Student Room Group


A 110v power source in the workshop provides power to a circuit as shown, use the kirchoffs laws to calculate the internal resistance of the power source. Perform calculations on direct current series , parallel and combination circuit.

Help much appreciated
Have the picture for this but won’t allow me to download to here
(edited 2 months ago)
Reply 1
Id simplify the circuit so the last 3 resistors on the right are in series so can be modelled as one resistor.
Then label a resistor 'r' next to power source which represents internal resistance.
Then you can use kirchoffs laws.

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