What is the Voltage Between Point B and Point C in this Circuit?

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The circuit consists of a 107.5 V battery at point B, followed by two parallel resistors leading to point C, and an additional resistor after point C. To find the voltage between points B and C, the total resistance of the two parallel resistors should be calculated first. The voltage at point C can be determined using the potential divider rule, which considers the resistances involved. The final voltage difference between points B and C is then derived from the battery voltage minus the voltage at point C. This method clarifies the relationship between the components and the voltage drop across the circuit.
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A battery has a voltage of 107.5 V. We denote this battery with point B. Point C is the point after two resistors, which are parallel to one another. Immediately after point C we get one more resistor. Calculate the voltage between B and C.

I calculated the total resistance between B and C and from there, I calculated the voltage. However my teacher says that I should take resistor 3, which is situated after point C. Is it just me, or is he wrong?
 
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It's hard to interpret what your circuit looks like from the description but it looks like

Battery +ve --- Point B --- 2 resistors in parallel --- Point C ---- one resistor --- Battery -ve

If that is correct..

Step 1 Convert the two resistors in parallel to one..

Battery +ve --- Point B --- one resistor(R1) --- Point C ---- one resistor(R2) --- Battery -ve

Then the voltage at point C with respect to the battery -ve can be calculated using the potential divider rule..

Vc = Vbat * R2/(R1+R2)

The voltage requested Vb-Vc = Vbat - Vc = Vb - (Vbat * R2/(R1+R2))
 

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