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Chapter 4: Q36E (page 843)
If a “75-W” bulb (see Problem 25.35) is connected across a 220-V potential difference (as is used in Europe), how much power does it dissipate? Ignore the temperature dependence of the bulb’s resistance.
The power dissipated across 220-V is 252 W.
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Section 27.2 describes a procedure for finding the direction of the magnetic force using your right hand. If you use the same procedure, but with your left hand, will you get the correct direction for the force? Explain.
A rule of thumb used to determine the internal resistance of a source is that it is the open circuit voltage divide by the short circuit current. Is this correct? Why or why not?
Batteries are always labeled with their emf; for instances an AA flashlight battery is labelled “ 1.5 V ”. Would it also be appropriate to put a label on batteries starting how much current they provide? Why or why not?
An electrical conductor designed to carry large currents has a circular cross section 2.50 mm in diameter and is 14.0 m long. The resistance between its ends is . (a) What is the resistivity of the material? (b) If the electric-field magnitude in the conductor is 1.28 V/m, what is the total current? (c) If the material has free electrons per cubic meter, find the average drift speed under the conditions of part (b).
The energy that can be extracted from a storage battery is always less than the energy that goes into it while it is being charged. Why?
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