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Chapter 21: Q9CQ (page 771)
If two household lightbulbs rated 60W and 100W are connected in series to household power, which will be brighter? Explain.
In series to household power, W bulb will be brighter.
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The hot resistance of a flashlight bulb is , and it is run by a alkaline cell having a internal resistance. (a) What current flows? (b) Calculate the power supplied to the bulb using . (c) Is this power the same as calculated using?
(a) What is the internal resistance of a voltage source if its terminalvoltage drops by 2.00 V when the current supplied increases by 5.00 A?(b) Can the emf of the voltage source be found with the information supplied.
Find the resistance that must be placed in parallel with a \(10.0 - \Omega \) galvanometer having a \(100 - \mu A\) sensitivity to allow it to be used as an ammeter with:
(a) a \(20.0 - A\) full-scale reading, and
(b) a \(100 - mA\) full-scale reading.
A heart defibrillator being used on a patient has an RC time constant of due to the resistance of the patient and the capacitance of the defibrillator. (a) If the defibrillator has ancapacitance, what is the resistance of the path through the patient? (You may neglect the capacitance of the patient and the resistance of the defibrillator.) (b) If the initial voltage is, how long does it take to decline to?
What are the largest and smallest resistances you can obtain by connecting a, a, and aresistor together?
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