Prefix conversion: A half-watt is equal to how many milliwatts (mW)?

Introduction / Context:
Quickly converting between watts and milliwatts is essential when matching component power ratings and interpreting datasheets. This problem checks familiarity with the 10^3 relationship between W and mW.

Given Data / Assumptions:

• Half-watt = 0.5 W.
• 1 W = 1,000 mW.

Concept / Approach:
To convert watts to milliwatts, multiply by 1,000. Apply this directly to 0.5 W to get the value in mW.

Step-by-Step Solution:

Verification / Alternative check:
Reverse: 500 mW / 1,000 = 0.5 W, confirming the conversion is correct.

Why Other Options Are Wrong:

• 5,000 mW: Equals 5 W, not 0.5 W.
• 5 mW: Equals 0.005 W, too small by a factor of 100.
• 50 mW: Equals 0.05 W, too small by a factor of 10.

Common Pitfalls:

• Misplacing the decimal during scaling by 1,000.

Final Answer:
500 mW