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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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Integrated Concepts
What current must be produced by a \({\rm{12}}{\rm{.0 V}}\) battery-operated bottle warmer in order to heat \({\rm{75}}{\rm{.0 g}}\) of glass, \({\rm{250 g}}\) of baby formula, and \({\rm{3}}{\rm{.00 \times 1}}{{\rm{0}}^{\rm{2}}}{\rm{ g}}\) of aluminium from \({\rm{20}}{\rm{.0}}^\circ {\rm{C}}\) to \({\rm{90}}{\rm{.0}}^\circ {\rm{C}}\) in \({\rm{5}}{\rm{.00 min}}\)?
Explain the properties of myelinated nerves in terms of the insulating properties of myelin.
With a \(1200\;W\) toaster, how much electrical energy is needed to make a slice of toast (cooking time \(1\) minute)? At \(9.0{\rm{ }}cents/kW/h\), how much does this cost?
(a) At what two times in the first period following \(t = 0\) does the instantaneous voltage in \(60 - Hz\) \({\rm{AC}}\) equal \({V_{rms}}\) ?
(b) \({V_{rms}}\)?
What power is supplied to the starter motor of a large truck that draws \(250\;A\) of current from a \(24.0\;V\) battery hook-up?
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