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

  • Thread starter Thread starter tomkoolen
  • Start date Start date
  • Tags Tags
    Points Voltage
AI Thread Summary
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.
tomkoolen
Messages
39
Reaction score
1
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?
 
Physics news on Phys.org
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))
 

Thread 'Errors and significant figures'

I multiplied the values first without the error limit. Got 19.38. rounded it off to 2 significant figures since the given data has 2 significant figures. So = 19. For error I used the above formula. It comes out about 1.48. Now my question is. Should I write the answer as 19±1.5 (rounding 1.48 to 2 significant figures) OR should I write it as 19±1. So in short, should the error have same number of significant figures as the mean value or should it have the same number of decimal places as...
View full post »
Thread 'A cylinder connected to a hanging mass'

Thread 'A cylinder connected to a hanging mass'

Let's declare that for the cylinder, mass = M = 10 kg Radius = R = 4 m For the wall and the floor, Friction coeff = ##\mu## = 0.5 For the hanging mass, mass = m = 11 kg First, we divide the force according to their respective plane (x and y thing, correct me if I'm wrong) and according to which, cylinder or the hanging mass, they're working on. Force on the hanging mass $$mg - T = ma$$ Force(Cylinder) on y $$N_f + f_w - Mg = 0$$ Force(Cylinder) on x $$T + f_f - N_w = Ma$$ There's also...
View full post »

Similar threads

Calculating the voltage across capacitors and resistors with switches
Replies
2
Views
735
Understanding example in Wikipedia entry for open circuit voltage
Replies
3
Views
2K
Ohm's Law - Finding Source Voltage
Replies
3
Views
1K
Write boolean expression describing this circuit
Replies
4
Views
982
How to determine if electrical components are connected in parallel or in series?
Replies
10
Views
909
B The voltage between two points
Replies
11
Views
2K
What does a Zener diode do in a circuit with non-ideal voltage source?
Replies
3
Views
900
Electronic Circuits - Calculate voltage
Replies
4
Views
919
Connecting a number of EMF sources in a circle to form a circuit
Replies
9
Views
1K
A problem in this photoelectric effect experiment
Replies
8
Views
931

Hot Threads

Recent Insights

Back
Top