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Chapter 20: Q19CQ (page 731)
What are the two major hazards of electricity?
Heat and electrical shock are the two most serious dangers linked with electricity.
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Why do voltage, current, and power go through zerotimes per second forrole="math" localid="1655530064198" -Hz AC electricity?
If two different wires having identical cross-sectional areas carry the same current, will the drift velocity be higher or lower in the better conductor? Explain in terms of the equation , by considering how the density of charge carriers relates to whether or not a material is a good conductor.
Find the time after \(t = 0\) when the instantaneous voltage of \(60 - Hz\) \({\rm{AC}}\) first reaches the following values:
(a) \({V_0}/2\)
(b) \({V_0}\)
(c) \(0\)
During open-heart surgery, a defibrillator can be used to bring a patient out of cardiac arrest. The resistance of the path is\({\bf{500}}\;{\bf{\Omega }}\), and a \({\bf{10}}\,{\bf{mA}}\)current is needed. What voltage should be applied?
Verify that the units of a volt-ampere are watts, as implied by the equation \(P = IV\).
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