A current source with an EMF of 12 V powers the lamps. What work did the outside forces do if a charge of 2 C flows through the lamp?
Task data: ε (EMF of the current source supplying the lamp) = 12 V; q (charge that flows through the lamp) = 2 Cl.
We express the work of external forces to move a given charge through the lamp from the formula: ε = Ast. / q, whence Ast. = ε * q.
Calculation: Ast. = 12 * 2 = 24 J.
Answer: Outside forces did the work 24 J.
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