An incandescent lamp is marked 40W, 240V. If resistance at room temperature (26 C) is 120 &ohm; and temperature coefficient of resistance is 4.5 10 3/ C , then its ON state filament temperature in C is approximately ___________.

An incandescent lamp is marked 40W, 240V. If resistance at room temper

1.	An incandescent lamp is marked 40W, 240V. If resistance at room temperature (26 C) is 120 &ohm; and temperature coefficient of resistance is 4.5 10 3/ C , then its ON state filament temperature in C is approximately ___________.
A.	1171
B.	2471
C.	1417
D.	All of the above
Answer» C. 1417

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An incandescent lamp is marked 40W, 240V. If resistance at room temperature (26 C) is 120 &ohm; and temperature coefficient of resistance is 4.5 10 3/ C , then its ON state filament temperature in C is approximately ___________.

An incandescent lamp is marked 40W, 240V. If resistance at room temperature (26 C) is 120 &ohm; and temperature coefficient of resistance is 4.5 10 3/ C , then its ON state filament temperature in C is approximately ___________.

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