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Chapter 27: Q. 12 (page 762)
The current in an electric hair dryer is . How many electrons flow through the hair dryer in min?
The number of electrons flows through the hairdryer inis
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21. A electric field creates a current in a -mm-diameter wire. What material is the wire made of?
What is the difference between current and current density?
You've been asked to determine whether a new material your company has made is ohmic and, if so, to measure its electrical conductivity. Taking a sample, you wire the ends of the long axis to a power supply and then measure the current for several different potential differences. Your data are as follows:
| Voltage (V) | Current (A) |
| 0.200 | 0.47 |
| 0.400 | 1.06 |
| 0.600 | 1.53 |
| 0.800 | 1.97 |
Use an appropriate graph of the data to determine whether the material is ohmic and, if so, its conductivity.
25. A battery provides of current.
a. At what rate is charge lifted by the charge escalator?
b. How much work does the charge escalator do to lift of charge?
c. What is the power output of the charge escalator?
The conducting path between the right hand and the left hand can be modeled as a 10-cm-diameter, 160-cm-long cylinder. The average resistivity of the interior of the human body is 5.0 鈩� m. Dry skin has a much higher resistivity, but skin resistance can be made negligible by soaking the hands in salt water. If skin resistance is neglected, what potential difference between the hands is needed for a lethal shock of 100 mA across the chest? Your result shows that even small potential differences can produce dangerous currents when the skin is wet.
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