1. **Problem Statement:** Describe the movement of charge in (a) a direct current (DC) supply and (b) an alternating current (AC) supply. 2. **Direct Current (DC) Supply:** - In a DC supply, the electric charge flows steadily in one direction through the conductor. - This means the charge carriers (usually electrons) move continuously from the negative terminal to the positive terminal. 3. **Alternating Current (AC) Supply:** - In an AC supply, the electric charge oscillates back and forth. - The direction of the current reverses periodically, causing the charge to move first in one direction and then in the opposite direction repeatedly. 4. **Summary of Movements:** - For DC: The charge moves in one direction. - For AC: The charge oscillates. 5. **Final Answers:** - (a) The charge moves in one direction. - (b) The charge oscillates.