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Unit : J/C or Volt

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- Energy converted per unit charge passing through a component

Work done by electron

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Tool to measure emf

Connected parallel across the component

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E = emf (J/C or Volt)
W = Work done (Joules)
Q = Charge (Coulomb)

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Tool to measure current

Connected in series with the circuits

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- Work done on the electron by the source (cell) in driving the unit charge around a complete circuit

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Conventional current direction (Direction of + charges)  : Positive to negative

Electron Direction : Negative to positive

(+) Terminal = High Potential
(-) Terminal = Low Potential

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- Rate of flow of charge

I = Q/t

I   = Current (C/s or A)

Q = Charge (coloumb)

t  = Time (second)

*note : A = Ampere