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Two 220 volt, 100 watt bulbs are connected first in series and then in parallel. Each time the combination is connected to a 220 volt a.c. supply line. The power drawn by the combination in each case respectively will be

Asked in CBSE AIPMT 2003 · Rated bulbs and appliances

• (1) 50 watt, 100 watt
• (2) 100 watt, 50 watt
• (3) 200 watt, 150 watt
• (4) 50 watt, 200 watt

Step-by-step solution

Why the other options are wrong

• (1) Series value right, but counts only one bulb in parallel; each of the two gets the full 220 V and draws 100 W.
• (2) No single slip gives this value; 100 W is one bulb alone and 50 W is the series value, so this order fits neither case.
• (3) No single slip gives this value; 200 W is the parallel value, and no arrangement of two such bulbs draws 150 W.

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