Electric current in a solid metal conductor is caused by the movement of what ?
Correct answer: B. Electrons
- A. Protons
- B. Electrons
- C. Metal atoms
- D. Metal ions
Explanation
In a solid metal, positive ions remain fixed in the crystal lattice while loosely bound electrons can drift through the conductor. This directed electron motion constitutes electric current. The likely choice is a, because students may confuse the mobile electrons with the stationary positive ions of the metal lattice.
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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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