2.1 KiB
T5A – Current and voltage: terminology and units, conductors and insulators, alternating and direct current
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T5A01 (D) Electrical current is measured in which of the following units? #card
- A. Volts
- B. Watts
- C. Ohms
- D. Amperes
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T5A02 (B) Electrical power is measured in which of the following units? #card
- A. Volts
- B. Watts
- C. Watt-hours
- D. Amperes
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T5A03 (D) What is the name for the flow of electrons in an electric circuit? #card
- A. Voltage
- B. Resistance
- C. Capacitance
- D. Current
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T5A04 (C) What are the units of electrical resistance? #card
- A. Siemens
- B. Mhos
- C. Ohms
- D. Coulombs
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T5A05 (A) What is the electrical term for the force that causes electron flow? #card
- A. Voltage
- B. Ampere-hours
- C. Capacitance
- D. Inductance
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T5A06 (A) What is the unit of frequency? #card
- A. Hertz
- B. Henry
- C. Farad
- D. Tesla
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T5A07 (B) Why are metals generally good conductors of electricity? #card
- A. They have relatively high density
- B. They have many free electrons
- C. They have many free protons
- D. All these choices are correct
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T5A08 (B) Which of the following is a good electrical insulator? #card
- A. Copper
- B. Glass
- C. Aluminum
- D. Mercury
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T5A09 (C) Which of the following describes alternating current? #card
- A. Current that alternates between a positive direction and zero
- B. Current that alternates between a negative direction and zero
- C. Current that alternates between positive and negative directions
- D. All these answers are correct
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T5A10 (C) Which term describes the rate at which electrical energy is used? #card
- A. Resistance
- B. Current
- C. Power
- D. Voltage
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T5A11 (D) What type of current flow is opposed by resistance? #card
- A. Direct current
- B. Alternating current
- C. RF current
- D. All these choices are correct
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T5A12 (D) What describes the number of times per second that an alternating current makes a complete cycle? #card
- A. Pulse rate
- B. Speed
- C. Wavelength
- D. Frequency