Chapter 28: Q. 7 (page 790)
What is the resistance of a hair dryer? What is the current in the hair dryer when it is used?
Short Answer
and.
Chapter 28: Q. 7 (page 790)
What is the resistance of a hair dryer? What is the current in the hair dryer when it is used?
and.
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Get started for freea. What are the magnitude and direction of the current in the resistor in FIGURE ?
b. Draw a graph of the potential as a function of the distance traveled through the circuit, traveling cw from at the lower left corner.
The five identical bulbs in FIGURE are all glowing. The battery is ideal. What is the order of brightness of the bulbs, from brightest to dimmest? Some may be equal.
A.
B.
C.
D.
The capacitor in an RC circuit is discharged with a time constant of . At what time after the discharge begins are
(a) the charge on the capacitor reduced to half its initial value and
(b) the energy stored in the capacitor reduced to half its initial value?
The flash on a compact camera stores energy in a capacitor that is charged to . When the flash is fired, the capacitor is quickly discharged through a lightbulb withof resistance.
a. Light from the flash is essentially finished after two time constants have elapsed. For how long does this flash illuminate the scene?
b. At what rate is the lightbulb dissipating energy after the flash is fired?
c. What total energy is dissipated by the lightbulb?
The circuit shown in FIGURE P28.48 is inside a diameter balloon filled with helium that is kept at a constant pressure of . How long will it take the balloon’s diameter to increase to 16 cm?
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