flyingjake
Watts are part of the electrical properties along with volts and amps. Laptop chargers have the same watts and volts but more amps.
This is incorrect, Watts (power) is the product of amps * volts. The formula is P = IV. Anything with the same power and voltage will have the same amps.
The volume of power consumed would be Watts * time and gets you to capacity and usage units like watt-hours.
Weight is my go to for any measurement I want to be reasonably precise, solids or liquids. my kitchen scale gets a lot of use.
that said, if this is a baked good like a cookie or brownie where you enjoy biting into the existing texture, I’d probably go with less precise and just cutting it by eye in whatever way seems less destructive. 1/5ths is a little tough though. I’d tend to go for 1/4 or 1/6 and feel better about the precision to cut something in half and then half again or in thirds and then half again.