A refrigerator draws 8 A from a 240 V outlet. If it runs for 3 hours, how much energy does it use in joules?
A2,880 J
B20,736,000 J
C5,760 J
D576,000 J
Explanation
📌 P = IV = 8 × 240 = 1,920 W. Energy = P × t = 1,920 × (3 × 3600) = 1,920 × 10,800 = 20,736,000 J. Distractor A: skipped time; C: hours instead of seconds; D: off by factor of 36.