Chapter 20: Q27CQ (page 732)
Why is the resistance of wet skin so much smaller than dry, and why do blood and other bodily fluids have low resistances?
Because water has a low resistance and is a strong conductor of electricity, ions are strong conductors and can be found in bodily fluids.
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What determines the severity of a shock? Can you say that a certain voltage is hazardous without further information?
How is the IR drop in a resistor similar to the pressure drop in a fluid flowing through a pipe?
A total of \({\bf{600}}\;{\bf{C}}\) of charge passes through a flashlight in\({\bf{0}}{\bf{.500}}\;{\bf{h}}\). What is the average current?
Two different electrical devices have the same power consumption, but one is meant to be operated on \(120 - V\) AC and the other on \(240 - V\)AC.
(a) What is the ratio of their resistances?
(b) What is the ratio of their currents?
(c) Assuming its resistance is unaffected, by what factor will the power increase if a \(120 - V\) AC device is connected to \(240 - V\) AC?
If aluminium and copper wires of the same length have the same
resistance, which has the larger diameter? Why?
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