Two bulbs, rated at 20W and 40W, at 220V, are connected in series with a 220V supply. The total power
in the system is
20
220 400 11
260W (3) 30W (4) & W
(1)
W
Answers
Answered by
0
Answer:Rating of bulbs hasn't been specified which is very important. Assuming each bulb is rated at 120V supply when connected across rated voltage i.e.120V supply then power dissipation across bulb will be 40W (or 100W). Rating is important because if 40W bulb rated at 120V supply is connected across 200V supply then it will not work (might burn or blow up), meaning a device can not work at a voltage much higher than its rated voltage.
Resistance of bulb is inversely proportional to its rated power, at same voltage because
P=(V*V)/R
Therefore R (40W bulb) > R (60W bulb) > R (100W bulb).
mark my answer as brainlist
Explanation:
Similar questions