A bulb of 100 W glows for 6 hours a day. The units of energy consumed in 7 days would be:

4.2 units

The correct answer is Option (2) → 4.2 units

To calculate the energy consumed,

Energy Consumed = Power (kW) × Time (h)

Given,

Power of bulb = 100 W = 0.1 kW

Time per day = 6 hours

Number of day = 7 days

∴ Energy consumed = 0.1 kW × 42 hours

= 4.2 kWh