# A.C. power supply voltage amplitude questions

• bluesteels
In summary: Another way to ask the question is:What is the average voltage over each complete cycle?Does that help?In summary, the average voltage is zero because the power supply is only providing power for half of a cycle.
bluesteels
Homework Statement
The voltage across the terminals of an ac power supply varies with
time. The voltage amplitude is V = 45.0 V. What
are (a) the root-mean-square potential difference Vrms and (b) the average
potential difference Vav between the two terminals of the power supply?
Relevant Equations
Vmax= square root 2*Vrms
I know that the answer for A is 31.82. But when i look up B why is it zero? can someone explain please

thank you

bluesteels said:
Homework Statement:: The voltage across the terminals of an ac power supply varies with
time. The voltage amplitude is V = 45.0 V. What
are (a) the root-mean-square potential difference Vrms and (b) the average
potential difference Vav between the two terminals of the power supply?
Relevant Equations:: Vmax= square root 2*Vrms

But when i look up B why is it zero? can someone explain please
What do you think the answer to (b) should be?

bluesteels said:
Homework Statement:: The voltage across the terminals of an ac power supply varies with
time. The voltage amplitude is V = 45.0 V. What
are (a) the root-mean-square potential difference Vrms and (b) the average
potential difference Vav between the two terminals of the power supply?
Relevant Equations:: Vmax= square root 2*Vrms

I know that the answer for A is 31.82. But when i look up B why is it zero? can someone explain please
Look at a graph of (sinusoidal) alternating voltage vs. time. Can you use the graph to explain why the average is zero?

Orodruin said:
What do you think the answer to (b) should be?
i know that it zero cause i look it up but idk why

bluesteels said:
i know that it zero cause i look it up but idk why
No, what do you think it should be without looking it up. Without referring to any authority, what do you think it should be?

bluesteels said:
they didnt give me time?
Another way to ask the question is:
What is the average voltage over each complete cycle?​
Does that help?

Also, you might want to reply to @Orodruin's Post #6!

## 1. What is A.C. power supply voltage amplitude?

A.C. power supply voltage amplitude refers to the maximum value of the alternating current (A.C.) voltage that is supplied to an electrical circuit. It is measured in volts (V) and is represented by the peak value of the sine wave that represents the A.C. voltage.

## 2. How is A.C. power supply voltage amplitude different from D.C. voltage?

A.C. power supply voltage amplitude is different from D.C. voltage in that it constantly changes in magnitude and direction, while D.C. voltage remains constant in both magnitude and direction. A.C. voltage is represented by a sine wave, while D.C. voltage is represented by a straight line on a graph.

## 3. Why is A.C. power supply voltage amplitude important?

A.C. power supply voltage amplitude is important because it determines the amount of power that can be delivered to an electrical circuit. It also affects the performance and efficiency of electrical devices, as well as the safety of electrical systems.

## 4. How is A.C. power supply voltage amplitude measured?

A.C. power supply voltage amplitude is measured using a voltmeter, which is a device that measures the voltage between two points in an electrical circuit. The voltmeter is connected in parallel to the A.C. power supply and the voltage reading is taken at the peak of the sine wave.

## 5. Can A.C. power supply voltage amplitude be adjusted?

Yes, A.C. power supply voltage amplitude can be adjusted using a voltage regulator. This device can increase or decrease the voltage amplitude to the desired level, ensuring that the correct amount of power is delivered to the electrical circuit.

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