When we say an appliance "uses up electricity," we mean
A) current disappears.
B) electric charges are dissipated.
C) voltage is lowered.
D) electric energy dissipates into heat.
Answer: D
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The most important, and least solvable, problem of coal power is generally agreed to be
A) its contribution to global warming. B) accidents. C) lack of sufficient coal resources. D) its contribution to acid rain. E) waste disposal.
A wave traveles through a medium. As the wave passes, the particles of the medium vibrate in a direction perpendicular to the direction of the wave's motion. The wave is:
a) longitudinal b) a pulse c) sine wave d) transverse
Which of the following NDI tests cannot be conducted on a ceramic material?
(a) Eddy current (b) Dye penetrant (c) X-ray (d) Ultrasonic pulse echo
A circuit consists of a conducting movable bar and a lightbulb connected to two conducting rails as shown in Figure OQ31.10. An external magnetic field is directed perpendicular to the plane of the circuit. Which of the following actions will make the bulb light up? More than one statement may be correct