Energy equals power times time

Steps:

• Convert time to seconds: 5.0 minutes = 300 s.
• Identify power: 10 W.
• Apply formula: Energy = power × time.
• Calculate: 10 W × 300 s = 3000 J.

Why D is correct:

• Electrical energy input is given by E = P × t, where P is power in watts and t is time in seconds, yielding 3000 J.

Why the others are wrong:

• A: Underestimates by factor of 1500, ignoring proper time conversion.
• B: Uses minutes directly (10 × 5 = 50), forgetting to convert to seconds.
• C: Halves the time conversion (10 × 30 = 300), using 0.5 minutes incorrectly.

Final answer: D