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'Why does a bulb turn on so fast even if electron drift velocity is relatively slow?'
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We have been set this assignment for homework. So far, this is my understanding:
'when you close switch and connect source of emf,
an electric field caused by emf is sent out through circuit at near the speed of light
which pushes the electrons (doing work on them so giving them energy /emf), starting the flow of charge.
electrons nearest to bulb will be pushed through bulb, giving bulb their energy, then reentering
the battery through positive rail to get more emf, once electron enters positive rail, the battery
does work on electron to get it out through negative rail, releasing electron back to circuit.'
Could anyone tell me if I have made any errors / misconceptions? thanks in advance
'when you close switch and connect source of emf,
an electric field caused by emf is sent out through circuit at near the speed of light
which pushes the electrons (doing work on them so giving them energy /emf), starting the flow of charge.
electrons nearest to bulb will be pushed through bulb, giving bulb their energy, then reentering
the battery through positive rail to get more emf, once electron enters positive rail, the battery
does work on electron to get it out through negative rail, releasing electron back to circuit.'
Could anyone tell me if I have made any errors / misconceptions? thanks in advance
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(Original post by Physikoi)
We have been set this assignment for homework. So far, this is my understanding:
'when you close switch and connect source of emf,
an electric field caused by emf is sent out through circuit at near the speed of light
which pushes the electrons (doing work on them so giving them energy /emf), starting the flow of charge.
electrons nearest to bulb will be pushed through bulb, giving bulb their energy, then reentering
the battery through positive rail to get more emf, once electron enters positive rail, the battery
does work on electron to get it out through negative rail, releasing electron back to circuit.'
Could anyone tell me if I have made any errors / misconceptions? thanks in advance
We have been set this assignment for homework. So far, this is my understanding:
'when you close switch and connect source of emf,
an electric field caused by emf is sent out through circuit at near the speed of light
which pushes the electrons (doing work on them so giving them energy /emf), starting the flow of charge.
electrons nearest to bulb will be pushed through bulb, giving bulb their energy, then reentering
the battery through positive rail to get more emf, once electron enters positive rail, the battery
does work on electron to get it out through negative rail, releasing electron back to circuit.'
Could anyone tell me if I have made any errors / misconceptions? thanks in advance
(IMO) you just need to talk about current is almost immediately "flowing" without the need of talking how the light bulb received.
The light DOES NOT get energy from the electrons.
The electrons that enter the light bulb MAY or MAY NOT return to the battery.
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