Energy equals power times time

Steps:

• Convert time to seconds: 5 minutes = 5 × 60 = 300 s.
• Use formula E = P × t, where P = 1000 W.
• Calculate: 1000 × 300 = 300,000 J.
• Note: Voltage is irrelevant since power is given directly.

Why D is correct:

• D (300,000 J) matches E = P t, the definition of energy as work done over time in joules.

Why the others are wrong:

• A: Assumes time in minutes without converting to seconds (1000 × 5 = 5,000 J).
• B: Unclear error, possibly misapplying voltage or partial time (e.g., 240 × 50).
• C: Mistakenly uses voltage instead of power (240 × 300 = 72,000 J).

Final answer: D