Question: What experiments would you use the Watt balance in?

Oliver Brown answered on 16 Mar 2015:

The Watt balance pits the electrical force against the weight of an object so it can be used to very precisely measure the mass of said object — like a very complicated set of scales! The experiment I would like to do however is to measure the value of a number called Planck’s constant. Planck’s constant (which is about 6.63 x 10^-34 Joule-seconds) sets the scale at which quantum physics becomes important! It’s also the ratio between the colour of light and the amount of energy a single light particle of that colour contains, so it’s an important and interesting number.

*edit*
6.63×10^-34 by the way, is 6.63 divided by a 1 and 34 zeroes! So pretty small…