I have certain questions which confuse me a great deal. I want to have a very basic and clear idea about some concepts. Here it goes:
1) I am really confused on how a battery actually works. The very basic question that I have is whether positive ions flow in a battery? I ask this because my textbook uses phrases like 'positive ion flow'. While explaining the working of a battery, it highlights the journey of a positive ion across the circuit. I get confused because positive ions don't move in a wire.
2) I know potential difference between two points is the amount of work that needs to be done to move a positive charge from one point to the other. But when we talk about a battery, my textbook uses the phrase 'Potential difference between the electrodes'. I don't quite understand what this means. Does this mean that one electrode of the battery has an excess of electrons and the other has deficiency? What is the path of a charge through a cell?
3) Also, what does 'Potential Drop' means? Why does the potential drop across a resistor? I tried reading some resources but I don't get it.
4) What is EMF? I know the basic definition, but can you please explain with simplicity?
I don't know if I'm unnecessarily confusing myself? Perhaps I should accept some things as facts. The main problem is that I really get confused while solving a problem. Clearing the questions I asked above would make me understand what I actually am doing while solving a question. Thank you!