Voltages of a,b,c: Explaining the Answers

  • Thread starter Josh225
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Vb = Vb - Vearth = 15V - 0V = 15VVc = Vc - Vearth = 8V - 0V = 8VIn summary, the voltage values in this circuit are referenced to the earthed point, which is assigned to be 0V. Therefore, Va is 20V, Vb is 15V, and Vc is 8V. This is because the voltages are referenced to the earthed point, which is considered the zero volt node.
  • #1
Josh225
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Homework Statement


See image attachedI don't understand why Va is 20 volts instead of it being 5 volts or a combination of the two. The same goes with Vb. I can see (but I am likely looking at it the wrong way) why Vc is 8 volts.. Because Vc is right next to the voltage source.

Can anybody please explain how I get to these correct answers? Thank you.

Homework Equations

The Attempt at a Solution


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Hi Josh225. The voltages are referenced to the earthed point; it is assigned to be 0V and everything else is referenced to that.

In the absence of instructions to the contrary, we always assume the Earth to be the zero volts node. So when we say another node is at X volts it is understood that this is w.r.t. the circuit's earth.

Vab = Va - Vb = 5V
Va = Va - Vearth = 20V - 0V = 20V
 

FAQ: Voltages of a,b,c: Explaining the Answers

What are the voltages of a, b, and c?

The voltages of a, b, and c refer to the electrical potential difference between two points in a circuit. It is measured in volts (V) and can vary depending on the components and configuration of the circuit.

How do you measure the voltages of a, b, and c?

The voltages of a, b, and c can be measured using a voltmeter. This device is connected in parallel to the component or points in the circuit and measures the potential difference between them.

What is the significance of the voltages of a, b, and c in a circuit?

The voltages of a, b, and c play a crucial role in determining the flow of electricity in a circuit. It helps determine the direction and magnitude of current and is essential in selecting the right components and ensuring the proper functioning of the circuit.

Can the voltages of a, b, and c change in a circuit?

Yes, the voltages of a, b, and c can change in a circuit. This can be due to changes in the components, the flow of current, or external factors such as temperature and resistance. These changes can affect the overall performance of the circuit.

How can you explain the voltages of a, b, and c to a non-technical person?

The voltages of a, b, and c can be compared to water pressure in a pipe. Just like higher water pressure can move water faster and farther, higher voltages can move electricity more efficiently through a circuit. Similarly, lower voltages may result in a slower or weaker flow of electricity.

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