Electron Flow in Electric Circuits

Steps:

• Current in a wire is due to the movement of charged particles.
• In metal wires, the charge carriers are negatively charged electrons.
• The cell's negative terminal repels electrons, pushing them toward the positive terminal.
• Thus, electrons flow from negative to positive terminal.

Why A is correct:

• By convention in circuits, electrons (negative charges) move from the negative terminal to the positive terminal, as defined by the direction of electron drift in conductors.

Why the others are wrong:

• B: Positively charged nuclei are fixed in the atomic lattice and do not move.
• C: Electrons move toward the positive terminal, not the negative.
• D: Nuclei do not move, and positive charges would flow oppositely if they did.

Final answer: A