Chapter 28: Q. 10 (page 790)
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.
Chapter 28: Q. 10 (page 790)
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.
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How much current flows through the bottom wire in , and in which direction ?
It seems hard to justify spending for a compact fluorescent lightbulb when an ordinary incandescent bulb costs . To see if this makes sense, compare a incandescent bulb lasting hours to a compact fluorescent bulb having a lifetime of hours. Both bulbs produce the same amount of visible light and are interchangeable. If electricity costs , what is the total cost—purchase plus energy— to obtain hours of light from each type of bulb? This is called the life-cycle cost.
For an ideal battery, closing the switch in FIGURE P28.54 does not affect the brightness of bulb A. In practice, bulb A dims just a little when the switch closes. To see why, assume that thebattery has an internal resistanceand that the resistance of a glowing bulb is.
a. What is the current through bulb A when the switch is open?
b. What is the current through bulb A after the switch has closed?
c. By what percentage does the current through A change when the switch is closed?
A waterbed heater uses of power. It is on of the time, off . What is the annual cost of electricity at a billing rate of ?
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