The three essential requirements for a useful electric circuit are:
A) A magnetic field, a path for current flow, and a switch.
B) A power source, a path for current flow, and a switch.
C) A power source, a path for current flow, and an electrical load.
D) A power source, a magnetic field, and a path for current flow.
C
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Straw, shredded bark, pine needles, and wood chips used around the bases of landscape plants are examples of what?
What will be an ideal response?
What colors of light are emitted by the sun?
a. visible light colors b. all colors c. far red and infrared d. blue and ultraviolet
Plumbing systems began to be developed in the United States in the
A. 1850s B. 1860s C. 1870s D. 1880s
Sensors that house an emitter and a receiver separately to create an infrared sensing barrier are known as a _______.
A. limit switch B. proximity switch C. light curtain D. pressure sensor