d ate:S2018 11:59:00 PM (10%) Problem 7: Consider three electric bulbs. Voltage
ID: 1869126 • Letter: D
Question
d ate:S2018 11:59:00 PM (10%) Problem 7: Consider three electric bulbs. Voltage drop across bulb #1 is i and current passing through it is 1 Voltage drop across bulb #2 is 2V with current passing through it 1/4. Voltage drop across bulb #3 is V 8 and current passing through it is 41 us Which bulb produces the greatest illumination? Grade Summ O Bulb #2 because it has greatest voltage drop. O Bulb #1 because of the greatestpowerdissipated. . O Bulb #3 because it has greatest current. OIt is impossible to answer without resistances of bulbs given Potential Submissions Attempts rem 01%per atte detailed view eted Hint Feedback leted pleted leted eted | | | Hints: 4%deduction per hint. Hints remaining:L Feedback: deduction per feedback All commt 2018 Expet TA LLCExplanation / Answer
Power is given by .
P =VI
Hence power for bulb 1.
P1 = VI
Power for bulb 2.
P2 = (2V*I/4)
= VI/2
=22
= P1 /2
Power for bulb 3.
P3 = (4V*I/8)
= VI/2
= P1 / 2
Hence power for bulb 1 is greater hence illumination of bulb is greater.
Option (ii) is correct.
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