Figuring this circuit out. HELP

• Skynt
In summary, the conversation discusses finding the resistance between points a and b, which is equal to 27/17 ohms. The hint is to determine the emf/I, where I is the current through the battery. Different methods, such as loop or nodal analysis, can be used to find the solution. The conversation also mentions the Y Delta transformation and the importance of understanding how resistors add in series or parallel.
Skynt
Okay I have to show that between points a and b the resistance (ab) is equal to 27/17 ohms.

Here's the diagram:

http://img231.imageshack.us/img231/4614/testln9.jpg

The hint was given to determine the emf/I where I is the current through the battery.
I've found different ways of getting 27/17 out of it but I need to be able to explain why.

Last edited by a moderator:
It's not obvious to me on how to combine the resistances so I'd use loop or nodal analysis.

How?

I forgot to mention that the EMF is connected across points a and b

I'm sure this is all in your text but:

Loop Analysis
http://mathonweb.com/help/backgd4.htm

Nodal Analysis
http://mathonweb.com/help/backgd5.htm

Y Delta Transformation
http://en.wikipedia.org/wiki/Y-Δ_transform

If you use the Y Delta method remember how resisters add based if they are in series or parallel. If you use either loop or nodal analysis then add up the current going out of node a or into node b. You'll do the same thing if you use loop analysis but you'll have to convert from current to voltage via ohms law.

1. What is the purpose of this circuit?

The purpose of this circuit is to control the flow of electricity and perform specific tasks, such as powering a device or controlling a motor.

2. How do I determine the components of this circuit?

To determine the components of a circuit, you will need to analyze the schematic or diagram of the circuit and identify the different parts, including resistors, capacitors, transistors, and other electronic components.

3. How do I calculate the voltage and current in this circuit?

To calculate voltage and current in a circuit, you will need to use Ohm's law, which states that voltage is equal to current multiplied by resistance. You will also need to take into account the different components and how they affect the flow of electricity in the circuit.

4. How can I troubleshoot this circuit if it is not working?

If your circuit is not working, you can troubleshoot it by checking each component for any damage or loose connections. You can also use a multimeter to measure the voltage and current at different points in the circuit to identify any issues.

5. What safety precautions should I take when working with circuits?

When working with circuits, it is important to follow safety precautions to avoid any potential hazards. These include wearing protective gear, such as gloves and safety glasses, ensuring the circuit is not connected to a power source while working on it, and using proper tools and techniques to handle the components.

• Introductory Physics Homework Help
Replies
16
Views
374
• Introductory Physics Homework Help
Replies
4
Views
507
• Introductory Physics Homework Help
Replies
3
Views
701
• Introductory Physics Homework Help
Replies
5
Views
459
• Introductory Physics Homework Help
Replies
21
Views
2K
• Introductory Physics Homework Help
Replies
13
Views
1K
• Introductory Physics Homework Help
Replies
8
Views
387
• Introductory Physics Homework Help
Replies
2
Views
963
• Introductory Physics Homework Help
Replies
7
Views
987
• Introductory Physics Homework Help
Replies
6
Views
745