Voltage B to D in a simple Circuit

In summary, the conversation is about solving a problem in a network by calculating the voltage between B and D. The equations used are KVL and Ohm's law. The solution involves finding the current in the circuit and using current divider formula to calculate the voltage across r2. The final answer is 38.333v with positive at B. The conversation also highlights the forum rules and the purpose of the forum to help people learn how to solve problems.
  • #1
Justkiller91
4
0

Homework Statement



For the network, calculate the voltage B to D

[IMG=http://img13.imageshack.us/img13/1478/66772606.jpg][/PLAIN]

Homework Equations


KVL, and Ohms law.


The Attempt at a Solution


This is what i have:
45v-25v=Vt=20v

Rt=4k+3K+2K=9k ohms
From here on i am not sure what i am supposed to do.
 
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  • #2
Well, you have the total voltage around the loop and the total resistance around the loop. Think you could get the current flowing? If you had that, what might you do next?
 
  • #3
I = V/R It = 20/9k=2.2mA
Now that I have that would i just use current divider formula?:

I= Rt/Rx*It Iab = 9k/2k*2.2mA = 9.9mA? Then would i just continue to find the currents?
 
  • #4
Justkiller91 said:
... Then would i just continue to find the currents?

Uh ... WHAT currents? You've already found the current. Do you have some reason to think there is more than one?
 
  • #5
This is frustrating and no help what so ever, obviously i am struggling with the problem and haven't been able to figure out what i need to do. Thanks for your time, I know mine has been wasted.
 
  • #6
The current in the circuit is (45v - 25v)/(2k+3k+4k) = 2.2mA.

The voltage across r2 is (3k)(2.2mA) = 6.666v, with r2's positive at C.

So voltage across BD is 45v - 6.666v = 38.333v with positive at B.
 
  • #7
Minki said:
The current in the circuit is (45v - 25v)/(2k+3k+4k) = 2.2mA.

The voltage across r2 is (3k)(2.2mA) = 6.666v, with r2's positive at C.

So voltage across BD is 45v - 6.666v = 38.333v with positive at B.

It's good that you want to be helpful but please re-read the forum rules. It is not the purpose of this forum to spoon-feed answers but rather to help folks learn how to solve problems.

I can see that the OP's frustration might have led you to charitably just give him the answer rather than continue to try to lead him to it, but again ... that's not what we do here.
 
  • #8
Oh OK, no problem, makes sense; I shall be more Socratic in future :)
 
  • #9
Thank you very much Minki, this has help a great amount. I now know how to solve this as well as similar problems
 
  • #10
Glad to be of help :)
 

FAQ: Voltage B to D in a simple Circuit

1. What is voltage B to D in a simple circuit?

Voltage B to D in a simple circuit refers to the potential difference between point B and point D in the circuit. It is a measure of the electrical energy that is being transferred from point B to point D.

2. How is voltage B to D measured in a simple circuit?

Voltage B to D can be measured using a voltmeter. The voltmeter is connected in parallel to the circuit, with one probe at point B and the other probe at point D. The reading on the voltmeter will indicate the voltage difference between the two points.

3. What factors affect voltage B to D in a simple circuit?

The main factor that affects voltage B to D in a simple circuit is the power source or battery. The voltage of the battery determines the potential difference between point B and point D. Other factors that may affect voltage include the resistance of the circuit, the type of wires used, and any other components in the circuit.

4. Can voltage B to D be negative in a simple circuit?

Yes, voltage B to D can be negative in a simple circuit. This happens when the potential difference between point B and point D is negative, indicating that the direction of the current flow is reversed. This can occur in circuits with certain components, such as diodes, or when the connections are reversed.

5. How does voltage B to D affect the overall circuit?

Voltage B to D is an important factor in determining the behavior of the overall circuit. It affects the flow of current and the amount of power transferred in the circuit. Changes in voltage B to D can also impact the performance of individual components in the circuit, such as light bulbs or motors.

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