Table of Contents

- 1 What is the relationship between phase angle and power factor of an AC circuit?
- 2 What does a resistor’s resistance depend on in a particular AC circuit?
- 3 How does phase angle affect power?
- 4 What is phase angle in ac circuit?
- 5 What is the phase difference between V and I in inductive circuit?
- 6 What is the relation between IR and V for the inductive circuit?
- 7 How do you find the average power of an AC circuit?
- 8 What is the difference between voltage and current in a circuit?

## What is the relationship between phase angle and power factor of an AC circuit?

When the power factor equals zero (0), the phase angle between the current and the voltage will be 90o as: cos-1(0) = 90o. In this case the actual power consumed by the AC circuit is zero regardless of the circuit current.

## What does a resistor’s resistance depend on in a particular AC circuit?

In DC circuits the linear ratio of voltage to current in a resistor is called its resistance. However, in AC circuits this ratio of voltage to current depends upon the frequency and phase difference or phase angle ( φ ) of the supply.

**What is the phase relationship between current and voltage across an inductive AC?**

There is no phase difference between voltage and current and the current and voltage is said to be in-phase.

**When AC is connected to a resistor What is the phase difference between the current and voltage?**

The phase difference between current and voltage in an AC circuit is 4Π radian.

### How does phase angle affect power?

Power delivery in an AC system depends on the phase angle between voltage and current. The phase angle also depends on the impedance of the circuit, which induces a phase change. When there is a phase difference between voltage and current, the real power delivered to a load can be quite low.

### What is phase angle in ac circuit?

In electronics, phase angle refers to the number of electrical degrees of lag or lead between the voltage and current waveforms in an ac circuit.

**What is resistance in an AC circuit?**

AC resistance is the resistance of the conductor, taking into effect the Skin and proximity effect. The one defined here is called inductive or capacitive reactance or impedance.

**Why does AC voltage applied across a load resistance produce alternating current in the circuit?**

When a constant voltage source or battery is applied across a resistor current is developed in resister. This current has a unique direction and flows from the negative terminal of a battery to positive terminal. The magnitude of the current remains constant as well.

#### What is the phase difference between V and I in inductive circuit?

The phase difference is <= 90 degrees. This leads to a positive phase for inductive circuits since current lags the voltage in an inductive circuit. The phase is negative for a capacitive circuit since the current leads the voltage.

#### What is the relation between IR and V for the inductive circuit?

VR equals the I.R voltage drop across the resistance which is in-phase with the current. VL equals the I.XL voltage drop across the inductance which leads the current by 90o.

**What is the phase difference between alternating EMF and alternating current in a capacitor circuit?**

The phase difference between the alternating current and emf is π/2.

**What is the phase of voltage in an AC circuit?**

For a resistance load in an AC circuit the voltage is in phase with the current. For an inductive load the current in an AC circuit is π/2 (90o) phase after the voltage (or voltage before the current). For a capacitive load the current in an AC circuit leads the voltage by π/2 (90o) phase.

## How do you find the average power of an AC circuit?

The average ac power is found by multiplying the rms values of current and voltage. Ohm’s law for the rms ac is found by dividing the rms voltage by the impedance. In an ac circuit, there is a phase angle between the source voltage and the current, which can be found by dividing the resistance by the impedance.

## What is the difference between voltage and current in a circuit?

Consider now a circuit which has only a capacitor and an AC power source (such as a wall outlet). A capacitor is a device for storing charging. It turns out that there is a 90 phase difference between the current and voltage, with the current reaching its peak 90 (1/4 cycle) before the voltage reaches its peak.

**What is the power consumed by a pure resistive AC circuit?**

In case of pure resistive AC circuits, the power consumed by the circuit is simply the product of voltage and the current as there is no phase angle between current and voltage. The power waveform for a pure resistive AC circuit is shown below. The power waveform consists of a series of positive pulses.