हिंदी
कर्नाटक बोर्ड पी.यू.सी.पीयूसी विज्ञान कक्षा ११

In a Circuit, Containing a Capacitor and an Ac Source, the Current is Zero at the Instant the Source Voltage is - Physics

Advertisements
Advertisements

प्रश्न

In a circuit, containing a capacitor and an AC source, the current is zero at the instant the source voltage is maximum. Is it consistent with Ohm's Law?

टिप्पणी लिखिए

उत्तर

Ohm's Law is valid for resistive circuits only. It is not valid for capacitive or inductive circuits, or a combination of both. 

shaalaa.com
  क्या इस प्रश्न या उत्तर में कोई त्रुटि है?
अध्याय 17: Alternating Current - Short Answers [पृष्ठ ३२८]

APPEARS IN

एचसी वर्मा Concepts of Physics Vol. 2 [English] Class 11 and 12
अध्याय 17 Alternating Current
Short Answers | Q 5 | पृष्ठ ३२८

संबंधित प्रश्न

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. Calculate P1/P2


Prove theoretically the relation between e.m.f. induced in a coil and rate of change of magnetic flux in electromagnetic induction.


The power factor of an a.c. circuit is 0.5. What is the phase difference between voltage and current in this circuit ?


For a given a.c., i = im sin ωt, show that the average power dissipated in a resistor R over a complete cycle is `1/2I_m^2` R .


Transformers are used ______.


An AC source rated 100 V (rms) supplies a current of 10 A (rms) to a circuit. The average power delivered by the source
(a) must be 1000 W
(b) may be 1000 W
(c) may be greater than 1000 W
(d) may be less than 1000 W


The current in a discharging LR circuit is given by i = i0 et , where τ is the time constant of the circuit. Calculate the rms current for the period = 0 to t = τ.


A coil has a resistance of 10 Ω and an inductance of 0.4 henry. It is connected to an AC source of 6.5 V, `30/pi Hz`. Find the average power consumed in the circuit.


In a series LCR circuit with an AC source, R = 300 Ω, C = 20 μF, L = 1.0 henry, εrms = 50 V and ν = 50/π Hz. Find (a) the rms current in the circuit and (b) the rms potential difference across the capacitor, the resistor and the inductor. Note that the sum of the rms potential differences across the three elements is greater than the rms voltage of the source.


Consider the situation of the previous problem. Find the average electric field energy stored in the capacitor and the average magnetic field energy stored in the coil.


In previous questions 3 and 4, what is the net power absorbed by each circuit over a complete cycle. Explain your answer.


Suppose the circuit has a resistance of 15 Ω. Obtain the average power transferred to each element of the circuit, and the total power absorbed.


Power factor of the A. C. circuit varies between ______.

The power factor of series LCR circuit when at resistance is


The series combination of R, L, C is connected to an a.c. source. If the resistance is 3 and the reactance is 4, the power factor of the circuit is:


An alternating current generator has an internal resistance Rg and an internal reactance Xg. It is used to supply power to a passive load consisting of a resistance Rg and a reactance XL. For maximum power to be delivered from the generator to the load, the value of XL is equal to ______.


An inductor of reactance 1 Ω and a resistor of 2 Ω are connected in series to the terminals of a 6 V (rms) a.c. source. The power dissipated in the circuit is ______.


Share
Notifications

Englishहिंदीमराठी


      Forgot password?
Use app×