Define emf, terminal potential difference, and internal resistance. Derive the relation between them for the circuit drawing current.
What is the difference between electromotive force (emf) and potential difference (pd)?
Is the terminal potential difference always greater than its emf?
When the ends of a wire are connected to a battery, initially the current is slightly larger, but soon it decreases slowly and becomes steady at a lower value although the emf of the battery remains unchanged. Explain.
Can the potential difference between terminals of battery ever be opposite in the direction of emf?
What is the difference between emfand potential difference? Under what circumstances are the potential difference between the terminals of a battery and the emf of the battery equal to each other?
Batteries are always labeled with their emf; for instance, an AA flashlight battery is labeled '1.5 volts'. Would it be appropriate to put a label on batteries stating how much current they provide? Why or why not?