Q: A rule of thumb used to determine the internal resistance of a
A rule of thumb used to determine the internal resistance of a source is that it is the open-circuit voltage divided by the short-circuit current. Is this correct? Why or why not?
See AnswerQ: Why does an electric light bulb nearly always burn out just as
Why does an electric light bulb nearly always burn out just as you turn on the light, almost never while the light is shining?
See AnswerQ: A light bulb glows because it has resistance. The brightness of
A light bulb glows because it has resistance. The brightness of a light bulb increases with the electrical power dissipated in the bulb. Fig. Q25.14: (a). In the circuit shown in Fig. Q25.14a, the...
See AnswerQ: The freshness of fish can be measured by placing a fish between
The freshness of fish can be measured by placing a fish between the plates of a capacitor and measuring the capacitance. How does this work? (Hint: As time passes, the fish dries out. See Table 24.1.)...
See AnswerQ: Electrolytic capacitors use as their dielectric an extremely thin layer of nonconducting
Electrolytic capacitors use as their dielectric an extremely thin layer of nonconducting oxide between a metal plate and a conducting solution. Discuss the advantage of such a capacitor over one const...
See AnswerQ: The energy that can be extracted from a storage battery is always
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?
See AnswerQ: Eight flashlight batteries in series have an emf of about 12 V
Eight flashlight batteries in series have an emf of about 12 V, similar to that of a car battery. Could they be used to start a car with a dead battery? Why or why not?
See AnswerQ: The two plates of a capacitor are given charges ±Q.
The two plates of a capacitor are given charges ±Q. The capacitor is then disconnected from the charging device so that the charges on the plates can’t change, and the capacitor is immersed in a tank...
See AnswerQ: Liquid dielectrics that have polar molecules (such as water) always
Liquid dielectrics that have polar molecules (such as water) always have dielectric constants that decrease with increasing temperature. Why?
See AnswerQ: Small aircraft often have 24-V electrical systems rather than the
Small aircraft often have 24-V electrical systems rather than the 12-V systems in automobiles, even though the electrical power requirements are roughly the same in both applications. The explanation...
See Answer
