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20: Know and Understand
Gold and copper are excellent conductors of electricity because atomically they each have a single _____ electron that is easily transferred across atoms
A. charged
B. covalent
C. neutral
D. valence
Insulators are not useful for carrying current because they _____ the flow of electrons; instead, insulators are useful for controlling electricity.
A. increase
B. restrict
C. redirect
D. supplement
Electric current in which the power source constantly switches from negative to positive and back again is _____ current.
Which two alternative electrical power production methods require large areas of dedicated acreage to harness significant amounts of power?
A. Solar and wind
B. Fuel cell and natural gas.
C. Water wheels and tide turbines.
D. Geothermal and coal.
A 100-watt lightbulb operating for 20 hours uses _____ kilowatt-hours of electricity.
A(n) _____ is the part of the circuit that does the work. Examples include power tools, lights, and electrical equipment.
_____ conductors become live when the circuit is complete.
The frequency of an AC signal is measured in _____, or cycles per second.
As a failsafe measure, switches are always installed on the _____ side of an electric circuit.
All loads have _____ measured in _____, which are represented by the symbol (Ω).
To compensate for _____ over long transmission distances, we should choose larger conductors with a lower resistance.
A(n) _____ is a weak link engineered into a circuit to serve as a failsafe in case of a current overload.
_____ are designed to protect buildings and equipment, while _____ are engineered to protect people from electric shock.
The true destructive measure of an electric shock’s intensity is the amount of _____ forced through the body.
Use a multimeter to see if a circuit has _____, indicating that it is not broken and will allow the flow of electricity.
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