Question

Measurement a
EXAMPLE
Taking electric potential V as a fundamental quan-
tity instead of electric current, find the dimension of
electric current in terms of the dimension of the
electric potential.
Panower)​

Answer 1

Explanation:

W = –ΔPE. For example, work W done to accelerate a positive charge from rest is positive and results from a loss in PE, or a negative ΔPE. There must be a minus sign in front of ΔPE to make W positive. PE can be found at any point by taking one point as a reference and calculating the work needed to move a charge to the other point.