1 kW = ___ W.

**The reasoning** This is about **metric prefixes** — the shortcuts we use to express large or small numbers in science. The prefix "kilo-" (symbol: k) always means "1000" in the metric system. Think of everyday examples: 1 kilogram = 1000 grams, 1 kilometer = 1000 meters, 1 kilowatt = 1000 watts. So: **1 kW = 1000 W** That's it! No calculation needed — just know what "kilo" means. --- **Why the wrong options tempt you** - **A) 10** — You might confuse "kilo" with "deci" (which means 1/10) - **B) 100** — This is "hecto" (symbol: h), like hectare. Easy mix-up if you're rushing - **D) 10,000** — This is actually "myria" (rarely used) or you're adding an extra zero by mistake The trap is forgetting which prefix means what power of 10. --- **Quick takeaway** **Kilo always equals 1000** — memorize this trio: kilogram (1000 g), kilometer (1000 m), kilowatt (1000 W). Once you lock in "kilo = 1000," you'll never miss these again!