Energy units: Convert watt-hour to joules. One watt-hour represents the energy expended by 1 watt sustained for 1 hour. What is this energy in joules? Choose the correct option.

Given

• 1 W = 1 J·s⁻¹
• 1 hour = 3600 s

CalculationEnergy = Power × Time = 1 J·s⁻¹ × 3600 s = 3600 J.

Check1 kWh = 1000 W × 3600 s = 3.6 × 10⁶ J (so 1 Wh = 3.6 × 10³ J).

Final Answer3600 J