Tuning of the radio is the best example of electrical_
Correct answer: A. Resonance
- A. Resonance
- B. Resistance.
- C. Current.
- D. None of these.
Explanation
When the frequency of the transmitted wave matches the one displayed on the radio, which is done by tuning it, the amplitude of the sound waves can be heard clearly but when the frequency is changed drastically the sound disappears, resonance only occurs when two waves are of near equal frequency which is best shown by the tuning of the radio.
This question appeared on the UHS MDCAT 2008 paper, which you can sit online with every answer explained.
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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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