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Chapter 25: Problem 41
A \(6.0-\mathrm{V}\) battery has internal resistance \(2.5 \Omega .\) If the battery is short-circuited, what's the rate of energy dissipation in its internal resistance?
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Show that the quantity \(R C\) has the units of time (seconds).
You're writing the instruction manual for a stereo amplifier with a maximum output of 100 W. The amplifier can be modeled as an emf in series with an \(8-\Omega\) resistance. What should you specify for the loudspeaker resistance to be used with the amplifier? How much power can the amplifier deliver to a speaker with half the optimum resistance?
An ammeter with resistance \(1.42 \Omega\) is connected momentarily across a battery, and the meter reads 9.78 A. When the measurement is repeated with a \(2.11-\Omega\) meter, the reading is \(7.46 \mathrm{A}\). Find (a) the battery voltage and (b) its internal resistance.
Two identical resistors in series dissipate equal power. How can this be, when electric charge loses energy in flowing through the first resistor?
Three 1.5 -V batteries, with internal resistances \(0.01 \Omega, 0.1 \Omega\) and \(1 \Omega\), each have \(1-\Omega\) resistors connected across their terminals. What's the voltage between each battery's terminals, to three significant figures?
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