# Circuit Analysis: Find E3 Given Diagram

• polymerase
In summary, the conversation is discussing a question about the emf E3 in a circuit with a switch. The question does not specify if the switch is open or closed, but it is mentioned that the answer is easy if the switch is open. The use of Kirchoff's laws is suggested and it is stated that the switch was invented for a reason. It is also mentioned that the value of E3 may be independent of other variables.
polymerase
The questions says that it doesn't matter if the switch is open or closed.

It asks, what is the emf E3 in terms of the other quantities shown.

I have attached a diagram of the circuit.

#### Attachments

• Circuit.jpg
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can anyone help with this problem please...

polymerase said:
can anyone help with this problem please...

We can't help because we can't see the figure yet (it has not been approved for viewing yet). Unless you have it available on some website and you provide the link or you describe it in words, we will have to wait before we can help.

If it doesn't matter, then E3 is just the voltage between those two points with the switch open.

Use Kirchoff's laws to solve this problem and ask if u get stuck somewhere.

The thing is.. in the homework forum.. we can't really help you unless you show some efforts from your side too.

rohanprabhu said:
Use Kirchoff's laws to solve this problem and ask if u get stuck somewhere.

The thing is.. in the homework forum.. we can't really help you unless you show some efforts from your side too.

What he said.

Also, is the switch open or closed? If it's open, then your answer is very easy.

polymerase said:
The questions says that it doesn't matter if the switch is open or closed.

that is impossible. You see.. switches were invented for a reason.

My guess is that the original problem statement is actually asking for E3 for either state of the switch.

wait a minute.. since E3 is the e.m.f of the battery.. isn't it totally arbitrary and as such independent of any other variables?

## 1. How do I identify E3 in a circuit diagram?

To identify E3 in a circuit diagram, look for the component or node that is labeled as E3. This could be a voltage source, resistor, or any other component that has been assigned the label E3. Additionally, E3 may be indicated by a specific symbol, such as a circle with a plus sign inside, depending on the notation used in the diagram.

## 2. How do I calculate the voltage at E3 in a circuit?

To calculate the voltage at E3, you will need to use the principles of Ohm's Law and Kirchhoff's Voltage Law. First, determine the total resistance of the circuit by adding up the resistances of all components in series. Then, use the equation V=IR to calculate the voltage drop across each component. Finally, use Kirchhoff's Voltage Law to sum up the voltage drops and determine the voltage at E3.

## 3. What factors can affect the voltage at E3 in a circuit?

The voltage at E3 can be affected by a variety of factors, including the resistance of individual components, the presence of other voltage sources in the circuit, and the overall complexity of the circuit. Additionally, changes in the circuit, such as adding or removing components, can also impact the voltage at E3.

## 4. Can I use different methods to find E3 in a circuit diagram?

Yes, there are multiple methods that can be used to find E3 in a circuit diagram. Some common methods include Kirchhoff's Laws, Thevenin's Theorem, and Superposition. The specific method used will depend on the complexity and characteristics of the circuit.

## 5. How can I verify my calculation for E3 in a circuit diagram?

To verify your calculation for E3, you can use a multimeter to measure the voltage at E3 directly. This will allow you to compare your calculated value to the actual value and make any necessary adjustments. Additionally, you can use simulation software to model the circuit and compare your results to the simulated values for E3.

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