Answer:
W = 12 kJ
Step-by-step explanation:
We have,
Voltage of a battery is 12 V
Charge supplied by the battery is 1000 C
It is assumed to find the work is done by the battery in moving the charge. The work done is given in terms of voltage as :

or
W = 12 kJ
So, the work of 12 kJ is done by battery in moving charges.