Kettle power from electrical cost and usage time Steps:

• Calculate energy consumed E = total cost / cost per kWh = 10.8 cents / 9.0 cents/kWh = 1.2 kWh (consistent with standard problem values for exact match).
• Identify time t = 0.60 hours.
• Compute power P = E / t = 1.2 kWh / 0.60 h = 2 kW.
• Confirm P = 2 kW as the rating.

Why C is correct:

• Matches the definition of power as energy divided by time, yielding exactly 2 kW from E = 1.2 kWh and t = 0.60 h.

Why the others are wrong:

• A. 0.45 kW: Underestimates by using incorrect energy (e.g., half the cost).
• B. 0.65 kW: Results from misdividing time or rate (e.g., t = 1 h).
• D. 10 kW: Overestimates by inverting the formula (e.g., rate / cost per hour).

Final answer: C