Tuning a radio is the best example of:
Correct answer: D. Electrical resonance
- A. Natural resonance
- B. Mechanical resonance
- C. Free resonance
- D. Electrical resonance
Explanation
Tuning a radio is the best example of electrical resonance. When we turn the knob of a radio to tune a station, we are changing the natural frequency of the electric circuit of the receiver to make it equal to the transmission frequency of the radio station. When the two frequencies match, energy absorption is at its maximum, and this is the only station we hear.
This question appeared on the UHS MDCAT 2016 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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