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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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Refer to Figure 21.7and the discussion of lights dimming when a heavy
appliance comes on. (a) Given the voltage source is 120 V, the wire resistance is,and the bulb is nominally 75.0W , what power will the bulb dissipate if a total of 15.0 Apasses through the wires when the motor comes on? Assume negligible change in bulb resistance. (b) What power is consumed by the motor?
Verify the third equation in Example 21.5 by substituting the values found for the currents.
Suppose you are using a multimeter (one designed to measure a range of voltages, currents, and resistances) to measure current in a circuit and you inadvertently leave it in a voltmeter mode. What effect will the meter have on the circuit? What would happen if you were measuring voltage but accidentally put the meter in the ammeter mode?
Is every emf a potential difference? Is every potential difference an emf? Explain.
The \({\rm{RC}}\) time constant in heart defibrillation is crucial to limiting the time the current flows. If the capacitance in the defibrillation unit is fixed, how would you manipulate resistance in the circuit to adjust the \({\rm{RC}}\) constant \(\tau \)? Would an adjustment of the applied voltage also beaded to ensure that the current delivered has an appropriate value?
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