T5A – Current and voltage: terminology and units, conductors and insulators, alternating and direct current 

- [[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