Hello. I'am a real newbie in electronics world. Just found this site while I was trying to learn. Some of my questions may sound stupid or funny, you may even laugh hard but I will still ask
I can solve some problems just by memorizing Ohm's law and some simple rules but in reality I understood nothing about electricity. Particularly I'm having hard time understanding electric potential energy.
I found this example on the Internet. In this, we spent 30 joules of energy against the force exerted by the big negative charge for pulling +3 coulombs of charges apart from that negative charge. Now they have a potential energy of 30 joules for 3C (means that they now have potential to do 30 joules of free work when we leave them free because the big negative charge attracts them, it's just like gravitational potential energy). And this is 10 joules/coulomb so it's said the potential difference between two points is 10 Volts. This makes perfect sense for me. But the problem is I can't imagine the same situation in a real circuit. For example we say its the resistance what uses the voltage thus reason of voltage drops. But in this example there is no resistor or any kind of resistance. Then how does the voltage get used up just by moving? (see question 1 below).
I also have few more questions:
1- Is resistance the only thing that uses potential energy in a circuit? If yes I can't explain the situation described in the above image. If no, why do we neglect the energy loss caused by moving electrons in real circuits and only distribute voltage drops among resistors.
2- Imagine I just put the wires around the battery and think about the moment when it took 1 electron from high potential to low potential. That electron now has a potential energy equal to the energy spent when moving the charge from high to low potential. But since a battery doesn't generate electrons (and just providing force to move them) and all electrons were already there in the copper wire, how did other electrons get their potential energy? The battery hasn't done any work for them (or did it?). I know they should have potential energy because the negative charges repel and and positive charges attract thus they are biased toward the positive end but I can't explain this in terms of work and energy. To simplify: Why do electrons flowing through the wire has potential energy. Is it because the battery spent energy taking them from low potential to high potential or is it because of repel/attaction caused by charges in terminals or both(need explanation)?
Probably stupid questions and I think something(if not everything) wrongly, I've always been very bad in Physics .
I can solve some problems just by memorizing Ohm's law and some simple rules but in reality I understood nothing about electricity. Particularly I'm having hard time understanding electric potential energy.
I found this example on the Internet. In this, we spent 30 joules of energy against the force exerted by the big negative charge for pulling +3 coulombs of charges apart from that negative charge. Now they have a potential energy of 30 joules for 3C (means that they now have potential to do 30 joules of free work when we leave them free because the big negative charge attracts them, it's just like gravitational potential energy). And this is 10 joules/coulomb so it's said the potential difference between two points is 10 Volts. This makes perfect sense for me. But the problem is I can't imagine the same situation in a real circuit. For example we say its the resistance what uses the voltage thus reason of voltage drops. But in this example there is no resistor or any kind of resistance. Then how does the voltage get used up just by moving? (see question 1 below).
I also have few more questions:
1- Is resistance the only thing that uses potential energy in a circuit? If yes I can't explain the situation described in the above image. If no, why do we neglect the energy loss caused by moving electrons in real circuits and only distribute voltage drops among resistors.
2- Imagine I just put the wires around the battery and think about the moment when it took 1 electron from high potential to low potential. That electron now has a potential energy equal to the energy spent when moving the charge from high to low potential. But since a battery doesn't generate electrons (and just providing force to move them) and all electrons were already there in the copper wire, how did other electrons get their potential energy? The battery hasn't done any work for them (or did it?). I know they should have potential energy because the negative charges repel and and positive charges attract thus they are biased toward the positive end but I can't explain this in terms of work and energy. To simplify: Why do electrons flowing through the wire has potential energy. Is it because the battery spent energy taking them from low potential to high potential or is it because of repel/attaction caused by charges in terminals or both(need explanation)?
Probably stupid questions and I think something(if not everything) wrongly, I've always been very bad in Physics .