Multiple choice

If three bulbs with power rating of 40 W, 60W, 100 W are connected in series to a 220 V mains; the energy consumption will be the _____________.

  1. highest for 100 W bulb

  2. highest for 60 W bulb

  3. highest for 40 W bulb

  4. same for all three bulbs

  5. none of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

In a series connection, the same current flows through all resistors or bulbs. The power dissipated is given by P = I^2 * R, meaning the component with the highest resistance consumes the most power. Since power rating under normal voltage is P = V^2 / R, a lower wattage bulb has a higher resistance, resulting in higher energy consumption when connected in series.

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