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# Alternating Current Concepts

Created by
@FaultlessMarsh8570

## Questions and Answers

It is reduced

Two

Twice each cycle

### What is the peak-to-peak value of a sine wave?

<p>The magnitude between peak positive and peak negative values</p> Signup and view all the answers

### Which of the following best defines instantaneous voltage or current?

<p>The value at any time on the sine wave</p> Signup and view all the answers

### How does an increase in poles affect the number of cycles completed in a revolution by a generator?

<p>Increases the number of cycles</p> Signup and view all the answers

### In a three-phase AC generator, what is the phase difference between the three conductors?

<p>120°</p> Signup and view all the answers

### If two sine waves are out of phase, what does it mean?

<p>They do not reach their maximum and minimum points at the same time</p> Signup and view all the answers

### Which of the following is NOT a type of AC signal waveform mentioned in the text?

<p>Gaussian wave</p> Signup and view all the answers

### What is a distinguishing feature of alternating waves, according to the text?

<p>Equal areas are enclosed above and below the time axis</p> Signup and view all the answers

### In the context of AC signals, what does the term 'waveform' refer to?

<p>The shape of the signal over time</p> Signup and view all the answers

### Which of the following statements about AC voltage levels is true, based on the information in the text?

<p>They alternate between positive and negative values</p> Signup and view all the answers

### What determines the direction of current movement in an alternating current (AC) circuit?

<p>The generated terminal voltage polarities</p> Signup and view all the answers

### What is the relationship between the amplitude of the positive and negative alternations in an AC waveform?

<p>The amplitude of the positive alternation and the amplitude of the negative alternation are the same</p> Signup and view all the answers

### What is the relationship between the current in an AC circuit and the current in a DC circuit?

<p>AC current is a function of time, while DC current is constant</p> Signup and view all the answers

### What is the most common waveform used to represent AC?

<p>Sinusoidal wave</p> Signup and view all the answers

### What is the relationship between the speed of a conductor cutting through a magnetic field and the induced EMF?

<p>The faster the conductor cuts through the magnetic field, the greater the induced EMF</p> Signup and view all the answers

### What is the purpose of a filter in an electrical circuit?

<p>To remove unwanted frequency components from the signal</p> Signup and view all the answers

## Study Notes

### Sine Waves and AC Power

• The period of a sine wave is the time taken for one cycle, and it decreases as the rotational speed (rpm) increases.
• The number of poles in a generator affects the number of cycles completed in a revolution (e.g., two-pole generator completes one cycle per revolution, four-pole generator completes two cycles per revolution).
• Peak voltage or current occurs twice in each cycle, at the positive and negative maximum values.
• Peak-to-peak voltage or current is the magnitude of the voltage or current between the peak positive and peak negative values.
• Instantaneous voltage or current is the value at any time on the sine wave, ranging from zero to peak value.

### Phase and Sine Waves

• Sine waves can be in-phase or out of phase, depending on whether they reach their maximum and minimum points at the same instant of time.
• When sine waves are out of phase, a phase difference exists between them, meaning they do not reach their maximum and minimum points simultaneously.

### Three-Phase AC Power

• A three-phase (3Ø) generator has three conductors, producing three phases of AC power that are 120° apart.
• Three-phase AC power is used in many applications.

### AC Signal Types

• AC signals include sine waves, square waves, triangular waves, and sawtooth waves, among others.
• AC voltage levels change with time, alternating between positive and negative values.
• The distinguishing feature of alternating waves is that equal areas are enclosed above and below the time-axis.
• The amplitude of the positive and negative alternations are the same.

### Simple AC Generator

• A simple AC generator consists of a coil rotated through a uniform magnetic field at a constant speed.
• The sinusoidal sine wave represents the induced EMF at each instant of time during 360° rotation of the loop.
• AC, unlike DC, flows first in one direction and then in the opposite direction.
• The current amperage is a function of time, unlike DC amperage which is constant.

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## Description

Test your knowledge on concepts related to alternating current, including positive and negative alternations, direction of current movement, voltage terminal polarities, and amplitude calculation.

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