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CBSE Class 10 Answered

two electric bulbs of 50 watt and 100 watt are given. which one will be brighter when they are connected (a)in series (b) in parallel? why?
Asked by | 21 May, 2013, 07:39: PM
answered-by-expert Expert Answer
1. In series connection - Current across 2 resistors is constant. P = I^2*R
Pconsumed (Brightness) ? V ? R ? 1/Prated i.e. in series combination bulb of lesser wattage will give more bright light. Hence, 50W bulb (220V) will be brighter. 
 
2. In parallel connection - Voltage drop across the 2 resistors is constant. P = V^2/R
Pconsumed (Brightness) ? PR ? i ? 1/R i.e. in parallel combination, bulb of greater wattage will give more bright light and more current will pass through it. So, 100W bulb will be brighter. 
Answered by | 22 May, 2013, 08:09: AM

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