At this stage of my education there's a lot of things that we're just supposed to accept and roll with it. Last year electricity was pretty much Ohm's law and Kirchoff's rules, now I've done electric fields so I'd like to understand it in more detail. Let's consider a simple circuit with a battery, switch and a light bulb. Does closing the switch generate a uniform electric field through the conductor? If so does this happen instantly? I mean if suddenly a planet appeared it would instantly have a gravitational field, does the same thing happen when we close the switch? Or is it just very fast and instant when the human eye is concerned? Field strength is constant so force on the electrons should be constant so why do they move constantly at drift velocity and not accelerate? I used to think of electrons carrying little packets of energy which they deliver to the bulb, the amount of which depends on the voltage. But what are these packets of energy really? Is it really kinetic energy that electrons gain from the battery which they deliver to the bulb. If so why don't they move more slowly once they deliver the energy? Usually if we have a uniform electric field (such as between plates of a capacitor) the electric potential isn't constant, but depends on the distance at which charge is from the plates. But in a circuit if we follow the wire from the battery to the bulb the potential is.constant at that whole part of the wire. Why is this? I guess the part I have the most problems is energy changes in a circuit. If anyone can make this clear to me I'll be in your debt forever.