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⚛️ Physics  ·  Alternating Current  ·  NEET & JEE

A transformer has 200 primary turns and 1000 secondary turns. Primary voltage is 220 V. Secondary voltage is:

Answer: 1100 V.

  • A 1100 V
  • B 44 V
  • C 220 V
  • D 2200 V

Correct answer: A. 1100 V

Explanation: V2/V1 = N2/N1 = 1000/200 = 5. V2 = 220 × 5 = 1100 V. This is a step-up transformer.

V and I Phase Relationships in AC CircuitsPure Inductor: I lags V by 90°VIPure Capacitor: I leads V by 90°VIMemory aid "ELI the ICE man": in an inductor (L) E(V) leads I; in a capacitor (C) I leads E(V)For a pure resistor, V and I stay perfectly in phase (no lag or lead at all)

In a pure inductor the current lags the voltage by 90° (energy is briefly stored in the magnetic field before current responds); in a pure capacitor the current leads the voltage by 90° (current must flow to build up charge before voltage rises) - the mnemonic "ELI the ICE man" keeps these straight.

Concept context

AC circuits, impedance, LCR series circuit, resonance, transformers, and power factor.

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