| 2026-03-20 | British engineer James |
| 2025-12-28 | Bit of power |
| 2025-11-30 | "W" on a light bulb |
| 2025-10-11 | Engineer who supposedly found inspiration while tending to a boiling kettle |
| 2024-11-06 | Unit of power |
| 2024-01-03 | Power unit |
| 2023-07-08 | J.J. or T.J. of the N.F.L. |
| 2021-09-08 | Unit commonly following "40," "60," "75" and "100" |
| 2021-07-13 | Electrical unit |
| 2021-03-15 | Light bulb unit |
| 2019-06-14 | 1/746 horsepower |
| 2019-06-12 | Light amount? |
| 2019-05-19 | Engineer who coined the term "horsepower" |
| 2019-02-15 | Power unit |
| 2017-11-04 | One joule per second |
| 2017-09-27 | Power figure? |
| 2017-04-13 | Power bit |
| 2017-04-08 | Inventor with three steam engine patents |
| 2016-01-15 | Steam engine pioneer James |
| 2015-11-18 | Joule/second |
| 2015-09-15 | Light bulb unit |
| 2015-05-03 | Light amount? |
| 2015-04-16 | ___-hour |
| 2014-11-09 | Bit of power |
| 2014-05-20 | Unit often preceded by kilo- |
| 2014-03-24 | Light bulb measure |
| 2014-02-22 | Volt-ampere |
| 2014-01-21 | Unit of power |
| 2013-07-30 | Word after 60-, 75- or 100- |
| 2013-03-03 | Bulb unit |
| 2012-08-27 | What "W" stands for on a light bulb |
| 2012-02-08 | James with an electrical unit named after him |
| 2011-12-12 | Light bulb unit |
| 2011-02-13 | Small bit of power |
| 2011-01-24 | Light bulb unit |
| 2010-09-04 | Steam engine pioneer |
| 2010-04-26 | The "W" of kWh |
| 2010-04-19 | Light bulb unit |
| 2010-03-28 | Eponymous engineer |
| 2008-12-14 | Small amount of power |
| 2008-12-01 | Power unit |
| 2007-09-21 | Volt-ampere |
| 2007-02-17 | Eponymous Scottish inventor |
| 2006-04-04 | Light bulb unit |
| 2006-02-13 | Light bulb unit |
| 2003-10-17 | Reagan's first interior secretary |
| 2002-04-23 | Light bulb unit |
| 1998-12-12 | Interior Secretary under Reagan |
| 1998-06-20 | Power unit |
| 1997-06-30 | Light bulb unit |
| 1996-08-12 | Bulb unit |
| 1994-06-20 | He coined the term "horsepower" |
| 1994-01-27 | Bulb measure |