In a step up transformer, if the voltage is doubled then for an ideal transformer the current in the secondary is
Correct answer: B. halved
- A. doubled
- B. halved
- C. unchanged
- D. quadrupled
Explanation
Power is conserved in an ideal transformer, so if the voltage doubles the current must halve to keep the product the same. This is why high voltage transmission lines carry surprisingly small currents. Any real transformer loses a few per cent, so the output power is slightly less than the input.
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About AC Through Resistor, Capacitor and Inductor
Alternating current through a resistor, capacitor and inductor involves phase relationships between voltage and current, reactance, impedance and energy transfer. A resistor keeps voltage and current in phase, while a capacitor and inductor produce opposite phase shifts, a distinction used in circuit diagrams and numerical calculations.
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