eli5: When a circuit is switched on, why does the current increase all at once to the maximum before gradually decreasing?
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This isn’t necessarily true. Different devices respond differently.
The current rushes in (almost) instantly because there is almost no inertia. Electrons are light and a “lot” current is very few moving electrons.
What happens next just depends on the circuit. In incandescent light bulbs the bulb heats up and so won’t let electricity flow as well.
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