Find Vth and Rth R1 1183k Ohm SolutionHere we need to keep

Solution

Here we need to keep the following into consideration:

1.) For resistors, say R1, R2, R3 and so on, connected in series, the net resistance is given as Rnet = R1 + R2 and so on.

2.) For resistors connected in parallel the net resistance is given as 1 / Rnet = 1 / R1 + 1 / R2 + so on.

3.) Current in all the components in series is same, while voltage across parallel connection is same.

Now, we need to determine the voltage differenece across R3 to get get Vo. We will find the current in the entire circuit first and using that we will find the potential difference across combination of R2 and R3 which in turn will be equal to Vo

So the net resistance of R2 and R3 would be: R₂₃ = 620 x 217 / 620 + 217 = 160.741 Ohms

Net resistance in the circuit = R1 + R₂₃ = 118.3 + 160.741 = 279.041 Ohms

That is current = 5 / 279.041 = 0.0179 Amperes

Therefore the voltage drop across R₂₃ will be I x R₂₃ = 0.0179 x 160.741 = 2.8773 V

Hence the voltage drop across R3 = 2.8773 V