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No, Rth is R1, R2, and R3 in parallel.Rth is found by opening R4 (load) and shorting V1. Simply calculate the value of R2 and R3 in parallel, then add the resistance of R1
No, Vth is the voltage across R4 when R4 is open-circuit. Vth=V1(R2||R3)/(R1+(R2||R3))Vth is found by using the voltage divider rule - 20v splis between R2 and R3, and Vth splits between R3 and R4
Then, use Ohm's Law to find the current through the load
We did this at the beginning of the year, so I apologise if Im a bit hazy
Completely missed that oneNo, Rth is R1, R2, and R3 in parallel.