What is the dimensional formula of potential difference

the formula for V is V = W / Q 
then W = F x L, 
then Q = I x T
then Dimension for Force (F) is [M][L][T]-2
Dimention for Length (L) is [L]
Dimention for current Electric (I) is [ I ]
Dimention for Time (T) is [T]
so
V = W / Q = (F x L) / (I x T)
V = ([M][L][T]-2[L]) / ([ I ][T])
= [M][L]2[T]-2[ I ]-1[T]-1
= [M][L]2[T]-3[ I ]-1
Dimention for Voltage is [M][L]2[T]-3[ A ]-1
..A=I...(Current)
 

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