Question

Two bulbs of 30W and 60 W are connected in parallel and in series? Which combination will provide more power? Also find the ratio of power produced by 30 W in the two combination. ​

Answer 1

Answer:

Rating of bulbs hasn't been specified which is very important. Let's assume each bulb is rated at 120V,50Hz supply. Now what it means is that when 40W (or 60W) bulb will be connected across rated voltage i.e.120V ac supply then power dissipation across it will be 40W (or 60W). Rating is important because say if 40W bulb rated at 120V supply is connected across 220V supply then it will not work (might burn or blow up), meaning thereby a device can not work at a voltage much higher than its rated voltage.

One more information that you get from rating is the resistance of each bulb.

P=(V*V)/R

Sin...

Explanation:

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