Discussion
Which circuit does a light emitting diode lamp require?
Answer: D
Diode current rises steeply with voltage, so a constant current driver is needed for consistent output and life. Series resistors genuinely are used for small indicator lamps, which makes the second option real for low power applications. Naming what changes and what stays the same is the reliable route through questions of this shape. The order in which the effects act is what decides the outcome, so it is worth establishing first. Working one numerical case through both cases side by side fixes the distinction better than any rule of thumb.
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