O Levels Physics (5054)•5054/11/M/J/19
Explanation
Diode Rectification for Battery Charging
Steps:
- AC supply produces alternating current, positive and negative half-cycles.
- Diode conducts only during the positive half-cycle relative to its orientation.
- This allows unidirectional current to flow into the battery, reversing the discharge direction.
- Negative half-cycle is blocked, preventing damage and enabling net charging.
Why A is correct:
- Circuit A orients the diode to conduct during the AC half-cycle that matches the battery's charging polarity, per diode's one-way conduction law.
Why the others are wrong:
- B: Diode reversed, blocks charging current entirely.
- C: Diode in parallel, bypasses battery without rectification.
- D: No diode, full AC damages battery via bidirectional flow.
Final answer: A
Topic: Action and use of circuit components
Practice more O Levels Physics (5054) questions on mMCQ.me