In the 2014 paper (q4.c.iv.) you have a capacitor in the standard set up, then it says the power supply is doubled from 12V to 24V and how this affects the temperature change in a bundle of wires.
How do you know to use the W=0.5CV^2 formula and not W=0.5QV
The first formula would say W increases by a factor of 4 (which is correct) whereas the other formula suggests it increases by a factor of 2...
Thanks