When replacing incandescent lamps with CFLs, replace existing 100, 95, and 90 watt incandescent bulbs with a __________ watt CFL.

a. 15
b. 20
c. 25
d. 50


c. 25

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When a semiconductor material is mixed with an impurity that has ____ valence electrons, such as arsenic or antimony, the lattice structure has an excess of electrons.

A. two B. three C. five D. seven

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Some natural resources are considered nonexhaustible. Others are renewable. What category does minerals fall into?

What will be an ideal response?

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The material used to absorb moisture inside an A/C system is called _______

A) Drier B) Desiccant C) PAG D) Ester

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What are the two main types of defrost controls used on heat pumps today?

What will be an ideal response?

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