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