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Electrical practice questions

27 questions from the amateur radio (technician) practice test.

Electrical practice test

10 questions, graded as you go, with the reason for every answer. No sign-up.

What this covers

Sample questions

The henry is the unit of which electrical property?

  1. Inductance
  2. Capacitance
  3. Impedance
  4. Frequency
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A. Inductance

Inductance is measured in henrys. Capacitance, the property most often swapped with it, is measured in farads.

Reference: Basic electrical units

What is impedance?

  1. The rate at which electrical energy is used, in watts
  2. The ability to store energy in an electric field, in farads
  3. The opposition to the flow of alternating current, in ohms
  4. The number of cycles completed each second, in hertz
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C. The opposition to the flow of alternating current, in ohms

Impedance is the total opposition a circuit presents to AC, combining resistance and reactance, and it is measured in ohms. The other choices describe power, capacitance and frequency.

Reference: AC circuit fundamentals: impedance

Three resistors of different values are connected in series across a battery. Which quantity is the same for all three?

  1. The current through each one
  2. The voltage across each one
  3. The power used by each one
  4. The resistance of each one
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A. The current through each one

A series circuit has only one path, so the same current passes through every component. The voltage divides among them according to their resistance.

Reference: Series circuits

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