When used precisely, “idling current” refers to the current needed to keep an electronic circuit (or a single device such as a vacuum tube or bipolar junction transistor) biased in its chosen operating condition in the absence of an input signal.

**Table of Contents**show

## What is Wattless current class 12th physics?

The current in an AC circuit is said to be Wattles Current when the average power consumed in such a circuit corresponds to Zero. Such current is also called as Idle Current. An AC circuit containing either capacitor or inductor current is said to wattles if the average power consumed in the circuit is zero.

## What are weightless current?

The current in an AC circuit is said to be Wattless Current when the average power consumed in such circuit corresponds to Zero. Such current is also called as Idle Current.

## What is meant by Wattless current?

Solution: The wattless current is defined as the current flowing in an electrical AC circuit such that the circuit consists of either a capacitor or inductor, then the current flowing in the circuit is said to be wattless if the average power consumed in the circuit is zero.

## What is the formula of Wattless current?

Hence, the formula for Calculating Wattless Current ” P = V I cos ϕ ” .

## Why is AC preferred over DC?

AC can be easily transformed to DC with the help of rectifiers whereas in DC it is not possible. AC can be easily stepped up or stepped down by transformers whereas in DC it is not possible because transformers work on a changing emf principle. Generation of AC is cheaper than DC power.

## What is the choke coil?

A choke coil is an inductance coil of very small resistance used for controlling current in an a.c. circuit. If a resistance is used to control current, there is wastage of power due to Joule heating effect in the resistance.

## What is meant by power factor 1?

A power factor of 1 indicates that the voltage and current are in phase and have a low-harmonic content. A power factor of 0 indicates that the voltage and current are 90-degrees out of phase.

## How zero gravity is created?

Microgravity, which is the condition of relative near weightlessness, can only be achieved on Earth by putting an object in a state of free fall. NASA conducts microgravity experiments on earth using drops towers and aircraft flying parabolic trajectories.

## Does zero gravity exist?

Contrary to popular belief, there’s no such thing as zero gravity. Weightlessness and zero gravity are two different things. The earth’s gravity keeps the moon in orbit. And astronauts are generally much closer to earth than the moon is, which means that the earth’s pull on them has to be much stronger.

## What is the difference between weightlessness and zero gravity?

Weightlessness is the complete or near-complete absence of the sensation of weight. This is also termed zero-G, although the more correct term is “zero G-force”. It occurs in the absence of any contact forces upon objects including the human body.

## What is power factor and Wattless current?

The power factor of an AC system is defined as the ratio of the real power flowing to the load, to the apparent power in the circuit. In a wattless current real power is zeron and hence power factor is zero.

## What is the full component of current?

Solution : The component of current (IRMS `cos phi`) which is in phase with the voltage is called active component. The power consumed by this current = `V_(RMS) I_(RMS) cos phi`. So that it is also known as . Wattful.

## What is the formula for power factor 12?

The power factor (cosφ) is the ratio of resistance and Impedance of an ac circuit i.e, Power factor, cosφ=ZR.

## What is the formula of Q factor?

The Q factor of the pMUT can be determined by the real part of the impedance frequency spectrum, which is defined as Q = fr/Δf, where the resonance frequency fr is the frequency at which the real part of the impedance reaches its maximum, Δf is the width of the peak at its half height, so-called 3 dB bandwidth.

## What is Wattless voltage?

The current which is involved in an alternating circuit(AC) is known as wattless currents, as the average power consumed in such a type of circuit corresponds to zero. In other words, the current which flows through such an electric circuit in which the power consumption is zero is known as wattless currents.

Peak value of AC voltage is root 2 times the rms value of AC voltage.

## Why is AC preferred over AC?

Alternating current (AC) is the type of electric current generated by the vast majority of power plants and used by most power distribution systems. Alternating current is cheaper to generate and has fewer energy losses than direct current when transmitting electricity over long distances.

## What device converts AC to DC?

A rectifier is an electrical device that converts alternating current (AC), which periodically reverses direction, to direct current (DC), which flows in only one direction.

## Why DC current is not used in homes?

It will more troublesome if touched because the voltage does not go through zero. Direct current can not be easily stepped up or stepped down with the help of transformers whereas alternating current can easily be converted from low voltage to high voltage or vice-versa with the help of transformers.

## Why is choke used?

A choke, also known as an inductor, is used to block higher-frequency while passing direct current (DC) and lower-frequencies of alternating current (AC) in an electrical circuit. The name comes from blocking, or “choking”, high frequencies while passing low frequencies.

## What is reactance in AC?

Reactance is the measure of the opposition to the flow of alternating current caused by the inductance and capacitance in a circuit rather than by resistance. Steady electric currents flowing along conductors in one direction undergo opposition called electrical resistance, but no reactance.

## What is difference between choke and inductor?

Main Differences Between Inductors and Chokes Inductors can generate magnetic fields and can also store energy within magnetic fields. A choke’s primary purpose is to remove AC current and pass DC current. Radiofrequency (RF) chokes rely on increasingly larger inductor sizes to block low-frequency signals.

## What is the SI unit of power factor?

Power factor (PF) is the ratio of working power, measured in kilowatts (kW), to apparent power, measured in kilovolt amperes (kVA).

## What is kVA to kW?

P (power) = I (current) × V (voltage) That means that in DC circuits, 1 kVA is equal to 1 kW. That means that 1 kVA is equal to 1,000 watts. In alternating current (AC) circuits, where kVA to kW conversion is mostly used, the kVA to kW conversion depends on the power factor (PF).