Question

multiple choice question
an electric circuit contains some device in which work is done (a lamp, for example) and therefore must contain a device that gives the______.
protons the extra charge needed to repel the electrons along the circuit
electrons the correct spin direction for the device requiring the work
source of energy to move the charges to a higher potential against an electric field
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Explanation:

In an electric circuit, work is done (e.g., in a lamp). To enable this, there must be a source of energy. This energy moves charges to a higher potential against an electric field. Protons do not repel electrons along the circuit in the described way. Also, the spin direction of electrons is not relevant to the basic requirement of having a device in the circuit for work - related energy provision.

Answer:

source of energy to move the charges to a higher potential against an electric field