The current through a metallic conductor is due to the motion of _________________?
Correct answer: A. free electrons
- A. free electrons
- B. protons
- C. neutrons
- D. still under controversy
Explanation
In a metallic conductor, the mobile charge carriers are free electrons, which drift through the lattice when an electric field is applied. Protons and neutrons remain bound inside atomic nuclei, so a student choosing protons is confusing the positive charge of the nucleus with the particles that actually carry current in metals.
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About Steady Current
Steady current is the continuous flow of charge at a constant rate through a conductor. The topic covers current, charge, potential difference, resistance, Ohm's law, resistivity and electrical power, along with series and parallel circuits, while distinguishing conventional current direction from electron motion.
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