Question

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Answer 1

The electromotive force (∈) = 2 V

Further explanation

Given

I=2 A

t = 30 s

E = 120 J

Required

The electromotive force (∈)

Solution

The electromotive force : the potential difference between two electrodes in galvanic cell

Can be formulated :

$\tt \epsilon=\dfrac{E}{Q}$

E = energy, J

Q = charge , Coulomb = i.t

$\tt \epsilon=\dfrac{120~J}{2~A\times 30~s}\\\\\epsilon=2~V$

Answer 2

Answer:

The electromotive force (∈) = 2 V

Further explanation

Given

I=2 A

t = 30 s

E = 120 J

Required

The electromotive force (∈)

Solution

The electromotive force : the potential difference between two electrodes in galvanic cell

Can be formulated :

E = energy, J

Q = charge , Coulomb = i.t

Explanation: