English
Karnataka Board PUCPUC Science Class 11

When an Ac Source is Connected to a Capacitor, There is a Steady-state Current in the Circuit. Does It Mean that the Charges Jump from One Plate to the Other to Complete the Circuit? - Physics

Advertisements
Advertisements

Question

When an AC source is connected to a capacitor, there is a steady-state current in the circuit. Does it mean that the charges jump from one plate to the other to complete the circuit?

Short Note

Solution

No. When an AC source is connected to a capacitor, there is a steady in the circuit to transfer change to the plates of the capacitor. This produces a potential difference between the plates. The capacitance is alternatively charged and discharged as the current reverses after each half cycle.

shaalaa.com
Different Types of AC Circuits: AC Voltage Applied to a Capacitor
  Is there an error in this question or solution?
Chapter 17: Alternating Current - Short Answers [Page 328]

APPEARS IN

HC Verma Concepts of Physics Vol. 2 [English] Class 11 and 12
Chapter 17 Alternating Current
Short Answers | Q 8 | Page 328

RELATED QUESTIONS

A capacitor acts as an infinite resistance for ______.


An AC source producing emf ε = ε0 [cos (100 π s−1)t + cos (500 π s−1)t] is connected in series with a capacitor and a resistor. The steady-state current in the circuit is found to be i1 cos [(100 π s−1)t + φ1) + i2 cos [(500π s−1)t + ϕ2]. So,


The AC voltage across a resistance can be measured using


A device Y is connected across an AC source of emf e = e0 sin ωt. The current through Y is given as i = i0 sin (ωt + π/2).

  1. Identify the device Y and write the expression for its reactance.
  2. Draw graphs showing a variation of emf and current with time over one cycle of AC for Y.
  3. How does the reactance of the device Y vary with the frequency of the AC? Show graphically.
  4. Draw the phasor diagram for device Y.

Suppose the initial charge on the capacitor is 6 mC. What is the total energy stored in the circuit initially? What is the total energy at later time?


Average power supplied to a capacitor over one complete cycle is ______.


A.C. power is transmitted from a power house at a high voltage as ______.


When an ac voltage of 220 V is applied to the capacitor C, then ______.


The electric mains supply in our homes and offices is a voltage that varies like a sine function with time such a voltage is called ... A... and the current driven by it in a circuit is called the ... B... Here, A and B refer to ______.

Of the following about capacitive reactance which is correct?

A capacitor has capacitance C and reactance X, if capacitance and frequency become double, then reactance will be ______.


A device ‘X’ is connected to an a.c source. The variation of voltage, current and power in one complete cycle is shown in figure.

  1. Which curve shows power consumption over a full cycle?
  2. What is the average power consumption over a cycle?
  3. Identify the device ‘X’.


Explain why the reactance provided by a capacitor to an alternating current decreases with increasing frequency.


Define Capacitive reactance.


An iron cored coil is connected in series with an electric bulb with an AC source as shown in figure. When iron piece is taken out of the coil, the brightness of the bulb will ______.


An a.c. source generating a voltage ε = ε0 sin ωt is connected to a capacitor of capacitance C. Find the expression for the current I flowing through it. Plot a graph of ε and I versus ωt to show that the current is ahead of the voltage by π/2.


Share
Notifications

Englishहिंदीमराठी


      Forgot password?
Use app×