Unit conversion check: How many watts are there in 40 kW?

Introduction / Context:
Unit conversions between prefixes (kilo, milli, micro) are routine in electrical engineering. Correctly scaling quantities prevents design errors and misinterpretation of specifications or measurements.

Given Data / Assumptions:

• Power given: 40 kW.
• 1 kilowatt (kW) = 1,000 watts (W).

Concept / Approach:
Apply the metric prefix conversion: multiply kilowatts by 1,000 to convert to watts. No additional calculations are needed.

Step-by-Step Solution:

Verification / Alternative check:
Reverse conversion: 40,000 W / 1,000 = 40 kW. The operation is consistent both ways.

Why Other Options Are Wrong:

• 0.4 mW, 400 W, 5,000 W: Incorrect scaling; these do not match the kilo-to-watt conversion.

Common Pitfalls:

• Mistaking kilo (10^3) for milli (10^-3) leading to inversion errors.

Final Answer:
40,000 W