Table of Contents

- 1 How do you find the phase relationship between voltage and current?
- 2 What happens when two sine waves are out of phase with each other?
- 3 How do you find the phase of a sine wave?
- 4 What is sine wave phase?
- 5 What is phase of a sine wave?
- 6 What is phase of sine wave?
- 7 When is a sine wave of voltage applied to a resistance?
- 8 Is the alternating current the same as the sine wave?

## How do you find the phase relationship between voltage and current?

The current and voltage in an RLC circuit are related by V = IZ. The phase relationship between the current and voltage can be found from the vector diagram: its the angle between the impedance, Z, and the resistance, R. The angle can be found from: If the angle is positive, the voltage leads the current by that angle.

**Does a sine wave have a phase?**

Any sine wave that does not pass through zero at t = 0 has a phase shift. The phase difference or phase shift as it is also called of a Sinusoidal Waveform is the angle Φ (Greek letter Phi), in degrees or radians that the waveform has shifted from a certain reference point along the horizontal zero axis.

### What happens when two sine waves are out of phase with each other?

If two sine waves have the same frequency but different phases, their summation is another sine wave with the same base frequency but a different amplitude and phase. When they are slightly out of phase with each other, the overall signal is diminished, and they are said to destructively interfere.

**What is the phase angle between voltage and current?**

The phase difference is <= 90 degrees. It is customary to use the angle by which the voltage leads the current. This leads to a positive phase for inductive circuits since current lags the voltage in an inductive circuit.

#### How do you find the phase of a sine wave?

Express a wave function in the form y = Asin(B[x – C]) + D to determine its phase shift C. For example, for the function cos(x) = sin(x+Pi/2) = sin(x – [-Pi/2]), we have C = -Pi/2. Therefore, shifting the phase of the sine function by -Pi/2 will produce the cosine function. 5.)

**How do you find the phase shift between two sine waves?**

The phase shift equation is ps = 360 * td / p, where ps is the phase shift in degrees, td is the time difference between waves and p is the wave period. Continuing the example, 360 * -0.001 / 0.01 gives a phase shift of -36 degrees.

## What is sine wave phase?

Phase difference (also called phase or phase shift) describes how much one sine wave is shifted relative to another. Sine waves that are perfectly aligned peak to peak are called in phase. The dotted sine curve is shifted 90 degrees (or a quarter wave) ahead of the solid curve.

**When two sine waves that are 180o out of phase are added together the amplitude of the sum is?**

Destructive interference

Destructive interference occurs when the maxima of two waves are 180 degrees out of phase: a positive displacement of one wave is cancelled exactly by a negative displacement of the other wave. The amplitude of the resulting wave is zero.

### What is phase of a sine wave?

Phase difference (also called phase or phase shift) describes how much one sine wave is shifted relative to another. Sine waves that are perfectly aligned peak to peak are called in phase.

**Why is there a phase difference between voltage and current?**

Ex: Capacitance of circuit try to maintain voltage but allows current to change suddenly and inductance try to maintain current but allows voltage to change suddenly and if one between inductance or capacitance of a circuit dominates the other then there is a phase difference between voltage and current.

#### What is phase of sine wave?

**How are voltage and current waves in phase?**

– Voltage and current waves in phase. In some circuits, several sine waves can be in phase with each other. Thus, it is possible to have two or more voltage drops in phase with each other and also be in phase with the circuit current. SINE WAVES OUT OF PHASE Figure 1-18 shows voltage wave E1which is considered to start at 0 (time one).

## When is a sine wave of voltage applied to a resistance?

When a sine wave of voltage is applied to a

**When do two sine waves go through the same point?**

When two sine waves, such as those represented by figure 1-17, are precisely in step with one another, they are said to be IN PHASE. To be in phase, the two sine waves must go through their maximum and minimum points at the same time and in the same direction.

### Is the alternating current the same as the sine wave?

The sine wave frequency of an alternating voltage is the same as the alternating current through a series connected load resistance. 15-4: Alternating Current Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display.