3. A 120V rms voltage at 60 Hz is applied across an inductor, a capacitor, and a

Question

3. A 120V rms voltage at 60 Hz is applied across an inductor, a capacitor, and a resistor in series. If the rms value of the current in this circuit is 0.6A, what is the impedance of this circuit? A) 1200 B) 200 ? C) 72 ? D) 320 ? 4. In a pure resistive circuit A) current lags behind the voltage by 90 B) current leads the voltage by 900 C) current can lead or lag the voltage 90° D) current is in phase with the voltage 5. In a pure inductive circuit A) the current is in phase with the voltage B) the current lags behind the behind the voltage 90° C) the current leads the voltag by 90° D) the current can lead or lag by 90o 6. Which one answer has the electromagnetic radiation correctly ordered from lowest energy to highest energy? A) ultraviolet, red, infrared, green B) radio waves, infrared, orange, violet C) X-rays, microwaves, yellow, blue D) green, red, X-rays, ultraviolet

Explanation / Answer

3) Irms = Vrms/Z

Z = Vrms/Irms = 120/0.6 = 200 ohms

Hence the impedance is 200 ohms. Option B is correct.

4) In a pure resistive circuit the current is in phase with voltage. Hence option D is correct.

5) In a pure inductive circuit the current lags voltage by 900 Hence option B is correct.

6) the order of frequency is radio waves, infrared, orange, violet so the energy is also of the same order. Hence option B is correct.

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