The 40 watt, 100 watt and 150 watt bulbs are connected in series across 220-volt supply. Which bulb will be brightest?
Correct answer: C. 40 Watt
- A. 150 Watt
- B. 100 watt
- C. 40 Watt
- D. All have same brighteness
Explanation
As they are connected in series so current across them will be same. the 40W bulb will hence experience less resistance than the other bulbs and hence will dissipate more energy or power and will glow the brightest.
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Steady current relates charge flow to potential difference, resistance and resistivity, including how temperature changes a conductor's resistance. Sources with internal resistance have terminal voltage below their emf when delivering current, and maximum power output occurs under a specific load condition rather than at zero resistance.
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