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# As physics question Watch

1. Determine the base units of potential difference
2. There's 7 international base units but only 6 we, as AS students, really need to know about. These are:

Distance - Metre (m)
Mass - Kilograms (kg)
Time - Second (s)
Electric Current - Ampere (A)
Amount of substance - Moles (mol)
Temperature - Kelvin (K)

We know that potential difference = energy transferred per unit charge = Joules per coulomb = Nm per C

1 Coulomb = 1 A in 1 S
Nm = kgms-2

Therefore V = (kgms-2 ) (m) / (A)(s)
= kg·m2 / s3 A
3. thanks so much

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Updated: May 14, 2016
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