# Basic Circuit Q: Voltage at Top & Bottom Nodes

• Engineering
• General_Sax
In summary, the conversation discusses a question about voltages at specific nodes and the use of mesh analysis and KCL to solve the problem. The validity of this strategy is questioned, and the importance of ensuring currents and voltages add up correctly is mentioned. Ultimately, the most important factor is finding a method that works, unless otherwise specified.
General_Sax

## Homework Statement

I have a question about the voltages at the top and bottom node

xx

## The Attempt at a Solution

If I make the mid-left node the reference node, and let's say V = 125V, then both the top and bottom nodes (in the middle branch) should be 125V and the middle (in the middle branch) should also be 0V, correct?

#### Attachments

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You could say that if R3 was equal to R4.

Do you know that it is?

If I'm only concerned about the currents, do I even need to know the voltages at the nodes?

I have all the source values and resistor values.

I solved the question using a combination of loop (mesh) analysis and KCL.

Does this sound like a valid strategy?

I'm asking because I can't afford to lose HW marks.

Thanks.

Go around the nodes and make sure the currents add up OK. Go around the loops and make sure the voltages add up OK.

If this shows it is OK then, sure, whatever works is fair enough, unless you are told to do it by some other particular method.

## 1. What is a basic circuit?

A basic circuit is a complete path that allows electricity to flow from a power source, through various components, and back to the power source. It typically includes a power source, such as a battery or wall outlet, wires, and various components such as resistors, capacitors, and diodes.

## 2. What is voltage?

Voltage is a measure of the electric potential difference between two points in a circuit. It is typically measured in volts (V) and represents the amount of energy that each unit of electric charge possesses. Voltage is responsible for causing the flow of electric current in a circuit.

## 3. What are top and bottom nodes in a circuit?

In a circuit, the top and bottom nodes refer to the two points where the voltage is being measured. The top node is typically the positive terminal of the power source, while the bottom node is the negative terminal. These nodes are important for understanding the flow of voltage and current in a circuit.

## 4. How is voltage measured in a circuit?

Voltage can be measured using a device called a voltmeter. The voltmeter is connected in parallel with the component or circuit being measured, and it provides a numerical value for the voltage at that point. Voltmeters typically have a range of measurement, so it's important to select the appropriate range for the specific circuit being measured.

## 5. How does voltage affect the behavior of a circuit?

Voltage is a key factor in determining the behavior of a circuit. It dictates the direction and magnitude of the electric current in the circuit. Higher voltage levels can cause more current to flow, while lower voltage levels may result in less current flow. Additionally, different components in a circuit will respond differently to varying voltage levels, allowing for a variety of functions and behaviors in a circuit.

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