The discussion revolves around the dimensional analysis of various physical quantities, particularly focusing on velocity and voltage. Participants explore how to intuitively understand and describe the dimensions of voltage, which is expressed as kg·m²/s³/A, and compare it to other units like velocity and electric charge.
Participants express multiple competing views regarding the choice of base units in the SI system and the intuitive understanding of voltage. The discussion remains unresolved with no consensus on the best approach to describe these dimensions.
Participants highlight the complexity of dimensional analysis and the potential for different interpretations based on the definitions of units. There are unresolved questions regarding the definitions of fundamental units and their implications for understanding physical quantities.
This discussion may be useful for students and professionals in physics and engineering who are interested in dimensional analysis and the foundational concepts of measurement in the SI system.
I think it was because when SI units were first introduced it was much, much easier to accurately measure current compared to measuring charge.DaveE said:BTW, why did the SI gurus choose Amps instead of Coulombs as a basic unit? Charge seems to me to be as basic as it gets.
Easier to realize the standard. Measuring current is a lot easier than measuring charge.DaveE said:BTW, why did the SI gurus choose Amps instead of Coulombs
There are many ways to factorise the dimensions of the volt.NODARman said:... then how can I describe volt which is kg ·m² /s³ /A ?
The force between two wires, in a current balance, is proportional to the product of the currents.DaveE said:BTW, why did the SI gurus choose Amps instead of Coulombs as a basic unit?