Discussion
Arrange these events in order as a transistor switch turns on.
1. Base charge begins to accumulate
2. Collector current starts to rise
3. Collector-emitter voltage falls towards saturation
4. Excess base charge builds up under overdrive
Select the correct sequence.
Answer: B
The order is 1, 2, 3, 4: charge must arrive before current flows, the voltage falls as the current rises through the load, and the excess charge that causes storage delay accumulates only once the device is already saturated. Tracing a switching sequence in terms of charge rather than voltage explains both the delays and why they differ between turn-on and turn-off.
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