Episode Details

We're going to follow Watt as he tries to put a price on a horse's effort, and that will show us exactly what work and power are. Then we'll open your electricity bill and see that you're paying for the thing Watt was trying to measure.

The listener can explain why the highest-wattage appliance in the house might not be the one that costs the most. They can also say the three formulas in order: work = force × distance in joules, power = work ÷ time in watts, and cost = kW × hours × price per kWh. Watt's failed pricing scheme is the system their family pays under today.

Sources:

• https://en.wikipedia.org/wiki/Horsepower
• https://www.scienceabc.com/eyeopeners/engine-power-measured-steam-engine-horsepowers-name-watt
• https://www.hagerty.co.uk/articles/automotive-history/the-work-and-life-of-the-man-who-invented-horsepower/

Source: Episode 16 - Physics Level 8, Work and Power (16/17)
Style: Exam prep
Length: 973 words, 6 min target
Generated: 2026-10-25