Household light bulbs have a given power rating, and they operate at 120 V. Whic

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Home Aptitude

Question
Household light bulbs have a given power rating, and they operate at 120 V. Which one of the following equations most directly provides the current rating of these light bulbs?
Options
A. P = I²R
B. P = IE
C. P = E²/R
D. I = P/E
E. None of the above

Correct Answer

I = P/E

1. Molecule is
Options
A. The smallest particle of a substance that retains the properties of that substance
B. A atom that has a shortage of electrons in its outer orbit
C. A atom that has an excessive number of electrons in its outer orbit
D. A atom that flows whenever there is an imbalance of electrical charges between two points
E. None of the above

3. Which one of the following statements best describes magnetic hysteresis?
Options
A. Hysteresis is the amount of magnetic flux that is not confined to the core material of an electromagnet
B. Hysteresis is most apparent when a steady amount of current is lowing through the coil of an electromagnet
C. Hysteresis is most apparent when the current through the coil of an electromagnet changes frequently
D. Hysteresis is most apparent when the core material is saturated
E. None of the above

4. Which one of the following statements best applies to a parallel RLC circuit?
Options
A. The voltage waveform for each component always has the same amplitude and phase as the applied voltage
B. The sum of the current is always less than the applied current
C. The current waveform for each component always has the same amplitude and phase as the applied current
D. All of the above
E. None of the above

6. Which one of the following phrases most accurately describes a purely inductive circuit?
Options
A. Resistances provide the only opposition to current flow
B. Inductive reactance provides the only opposition to current flow
C. Combinations of resistance and inductive reactance provide any opposition to current flow
D. The ac voltage lags the current by 90 degree
E. None of the above

7. The total impedance of a parallel RLC circuit:
Options
A. always increases as the applied frequency increases
B. is equal to the sum of the values of resistance, inductive reactance and capacitive reactance
C. always decreases as the applied frequency increases
D. is maximum at the resonant frequency
E. None of the above

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