LEARN MORE REMARKS This amount of energy might correspond to what a small office
ID: 1407650 • Letter: L
Question
LEARN MORE REMARKS This amount of energy might correspond to what a small office uses in a working day, taking into account all power requirements (not just lighting). In general, resistive devices can have variable power output, depending on how the circuit is wired. Here, power outputs were specified, so such considerations were unnecessary.
QUESTION Considering how hot the parts of an incandescent light bulb get during operation, guess what fraction of the energy emitted by an incandescent light bulb is in the form of visible light.
10%50% 80% LEARN MORE REMARKS This amount of energy might correspond to what a small office uses in a working day, taking into account all power requirements (not just lighting). In general, resistive devices can have variable power output, depending on how the circuit is wired. Here, power outputs were specified, so such considerations were unnecessary.
QUESTION Considering how hot the parts of an incandescent light bulb get during operation, guess what fraction of the energy emitted by an incandescent light bulb is in the form of visible light.
10%50% 80% 10%50% 80% PRACTICE IT (a) How many 75 W bulbs can operate with this voltage source?
bulbs
(b) At $0.110 per kilowatt-hour, how much does it cost to operate these bulbs for 5.00 h?
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Explanation / Answer
* 10 % f the energy emitted by an incandescent light bulb is in the form of visible light.
* power = voltage x current
P = V x I
= 120 V x 23.1 A
* it depends upon the rate declared per unit by your government
* for the next one also you must use the same method
120 x 18.8 = 2256 / 5
= 451.2 number of bulbs
= 2772 W
number of bulbs = 2772 / 75
= 36.96 bulbs
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