English
Tamil Nadu Board of Secondary EducationHSC Science Class 12

What is meant by wattles current?

Advertisements
Advertisements

Question

What is meant by wattles current?

Short/Brief Note
Advertisements

Solution

The component of current (IRMS sin φ), which has a phase angle of \[\frac{\pi}{2}\] with the voltage is called reactive component. The power consumed is zero. So that it is also known as ‘Wattless’ current.

shaalaa.com
  Is there an error in this question or solution?
Chapter 4: Electromagnetic Induction And Alternating Current - Evaluation [Page 260]

APPEARS IN

Samacheer Kalvi Physics - Volume 1 and 2 [English] Class 12 TN Board
Chapter 4 Electromagnetic Induction And Alternating Current
Evaluation | Q II. 19. | Page 260

RELATED QUESTIONS

An AC source generating a voltage e = e0sinωt is connected to a capacitor of capacitance C. Find the expression for the current i flowing through it. Plot a graph of e and i versus ωt.


An alternating e.m.f. of 0.2 V is applied across an LCR series circuit having R = 4 `Omega`, C = 80 µF and L = 200 mH. At resonance the voltage drop across the inductor is ____________.


In series 'LR' circuit and in series 'RC' circuit, same current is flowing. If the frequency of e.m.f. of a.c. is increased for both the circuits, the impedance will ____________.


In LCR series circuit, an alternating e.m.f. 'e' and current 'i' are given by the equations e = 100 sin (100 t) volt,

`"i" = 100  "sin" (100"t" + pi/3)"mA"`.

The average power dissipated in the circuit will be ____________.


The voltage gain of a CE amplifier is 50. A sinusoidal ac of amplitude 10 mV is applied as a signal. The output of the amplifier will be ______.


In a series LR circuit XL = R and power factor of the circuit is P1. When capacitor with capacitance C such that XL= XC is put in series, the power factor becomes P2. The ratio `"P"_1/"P"_2` is ______. 


Two unknown resistances are connected in two gaps of a meter-bridge. The null point is obtained at 40 cm from left end. A 30 Ω resistance is connected in series with the smaller of the two resistances, the null point shifts by 20 cm to the right end. The value of smaller resistance Ω is ______.


The effective capacitor between A and B in the following circuit is ______.


Explain the theory of an AC circuit with a resistor. 


In an a.c. circuit, voltage and current are given by:

V = 100 sin (100 t) V and I = `100 sin (100 t + pi/3)` mA respectively.

The average power dissipated in one cycle is:


Share
Notifications

Englishहिंदीमराठी


      Forgot password?
Use app×