# Circuit Analyses: Find E3 Given Diagram

• polymerase
In summary, the conversation discusses the importance of whether a switch is open or closed and its impact on the voltage of a capacitor or battery. The advice given is to use KVL equations and a reference node to solve for the desired variable. The use of universal schematic symbols is also recommended.
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 me with this question please...

It definitely matters whether the switch is open or closed. If the switch is open, one terminal of the capacitor E3 is floating, and it could potentially have any voltage you can imagine across it.

If the switch is closed, just write two KVL equations around each loop, and then use algebra to combine them.

- Warren

chroot said:
It definitely matters whether the switch is open or closed. If the switch is open, one terminal of the capacitor E3 is floating, and it could potentially have any voltage you can imagine across it.

If the switch is closed, just write two KVL equations around each loop, and then use algebra to combine them.

- Warren

they are NOT capacitors they are batteries, E1 and E2, and E3 are all batteries...

Okay. I'd advise that you use schematic symbols that are more universal, but that's okay. My advice remains: pick a reference node, write KVL around each loop, and solve for whatever variable you want.

- Warren

## 1. What is Circuit Analysis?

Circuit analysis is the process of studying and understanding electrical circuits to determine the flow of current and voltage through the various components of the circuit. It involves using mathematical calculations and principles to analyze and solve circuit problems.

## 2. What is E3 in circuit analysis?

E3, also known as the third loop equation or the mesh current method, is a technique used to solve for unknown currents in a circuit. It is used in more complex circuits where the traditional methods of analyzing circuits may be more difficult or time-consuming.

## 3. How do you find E3 in a circuit diagram?

To find E3 in a circuit diagram, you can use the third loop equation which states that the sum of the voltage drops around a closed loop in a circuit is equal to the sum of the voltage rises. This equation can be written and solved for the unknown current, E3.

## 4. What are the steps for solving for E3 in a circuit diagram?

To solve for E3 in a circuit diagram, you can follow these steps:

1. Identify the closed loop or mesh where E3 is located.
2. Write the third loop equation using the voltage drops and rises around that loop.
3. Solve the equation for E3.
4. Substitute known values for the other currents or voltages in the equation.
5. Solve for E3 using algebraic methods.

## 5. What are some common mistakes when finding E3 in circuit analysis?

Some common mistakes when finding E3 in circuit analysis include:

• Not identifying the correct loop or mesh where E3 is located.
• Incorrectly writing the third loop equation.
• Not considering the direction of the current in the equation.
• Making errors when solving the equation algebraically.
• Forgetting to substitute known values for other currents or voltages in the equation.

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