Question
What causes a voltage to appear across the secondary winding of a transformer when an AC voltage source is connected across its primary winding?
Answer Options
- A) Capacitive coupling
- B) Displacement current coupling
- C) Mutual inductance
- D) Mutual capacitance
Correct Answer: C
Explanation
A transformer works on the principle of electromagnetic induction, specifically between two coils. When an Alternating Current (AC) flows through the primary winding, it creates a constantly changing magnetic field. The core material concentrates this magnetic field.
This changing magnetic field then cuts across the secondary winding, inducing a voltage in the secondary coil. This inductive link between the two windings is called mutual inductance. This process allows energy to be efficiently transferred from the primary to the secondary winding without a direct electrical connection.
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