Quantrex Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app
COMEDK2023Evening ShiftPhysicsAlternating CurrentActual

The current drawn by the primary coil of an ideal transformer, which steps up 22 ~V into 220 ~V , to operate a device having a load resistance 110 is:

Options

  1. A20 A
  2. B1 A
  3. C10 A
  4. D2 A

Correct answer

A. 20 A

Step-by-step solution

For an ideal transformer, the power input equals the power output. Let V_p and I_p be the primary voltage and current, and V_s and I_s be the secondary voltage and current. Given V_p = 22 V and V_s = 220 V . The load resistance is R = 110 . The secondary current I_s is given by Ohm's law: I_s = V_s R = 220 V 110 = 2 A . Since the transformer is ideal, the power balance equation is V_p I_p = V_s I_s . Substituting the known values: 22 V I_p = 220 V 2 A 22 I_p = 440 I_p = 440 22 = 20 A . Answer: 20 A

Practice Alternating Current on Quantrex Academy →

More from Alternating Current

An electronic device operates at 2 MHz. The oscillating circuit has an inductance 20 10⁻⁵ H. What is the capacitive reactance of the resonant circuit? 2026When a current of 2.5 A passes through the primary coil of a transformer of 200 number turns, the magnetic flux linked with the secondary coil having 400 turns is 600 10⁻⁶ T m^2 . 2026In a given circuit, the instantaneous values of the alternating voltage and current are V = 0.5 (80 t + 3 ) volt and I = 0.5 (80 t) ampere respectively. Find the average power cons 2026A source of alternating emf = ₀ ( t) is connected to a capacitor. Then the instantaneous current in the circuit is: 2026If wattless current flows in an AC circuit, then the circuit is: 2026A solenoid having resistance R = 60 and inductance L = 0.4 H is connected to an AC source V = 100 2 200t . Find the maximum current. 2026In a circuit containing a pure resistor connected to an AC source, 2026A light bulb rated 100 W is connected to an AC source of 220 V, 50 Hz. The rms current through the bulb is 2026 Full Alternating Current list All COMEDK PYQs