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Chapter 4: Q17E (page 842)
In household wiring, copper wire 2.05 mm in diameter is often used. Find the resistance of a 24.0-m length of this wire.
Resistance of wire
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An emf source with E = 120 V, a resistor with R = 80.0 Ω, and a capacitor with C = 4.00 µF are connected in series. As the capacitor charges, when the current in the resistor is 0.900 A, what is the magnitude of the charge on each plate of the capacitor?
The capacity of a storage battery, such as those used in automobile electrical systems, is rated in ampere-hours .A battery can supply a current offor or for and so on. (a) What total energy can be supplied by a battery if its internal resistance is negligible? (b) What volume (in litres) of gasoline has a total heat of combustion equal to the energy obtained in part (a)? (See Section 17.6; the density of gasoline is .) (c) If a generator with an average electrical power output ofrole="math" localid="1655719210000" is connected to the battery, how much time will be required for it to charge the battery fully?
(a) What is the potential difference in the circuit of Fig. P25.62? (b) What is the terminal voltage of the battery? (c) A battery with emf and internal resistance is inserted in the circuit at d, with its negative terminal connected to the negative terminal of the battery. What is the difference of potential between the terminals of the battery now?
A 12.4-µF capacitor is connected through a 0.895-MΩ resistor to a constant potential difference of 60.0 V. (a) Compute the charge on the capacitor at the following times after the connections are made: 0, 5.0 s, 10.0 s, 20.0 s, and 100.0 s. (b) Compute the charging currents at the same instants. (c) Graph the results of parts (a) and (b) for t between 0 and 20 s
You want to produce three 1.00-mm-diameter cylindrical wires,
each with a resistance of 1.00 Ω at room temperature. One wire is gold, one
is copper, and one is aluminum. Refer to Table 25.1 for the resistivity
values. (a) What will be the length of each wire? (b) Gold has a density of.
What will be the mass of the gold wire? If you consider the current price of gold, is
this wire very expensive?
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