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.
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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.
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