Cells: Cells are the fundamental units of electrical circuits that generate and maintain electric current. They consist of one or more electrochemical react...
Cells:
Cells are the fundamental units of electrical circuits that generate and maintain electric current. They consist of one or more electrochemical reactions occurring within a sealed container, which allows the flow of charged particles (primarily electrons). When a cell is connected to a circuit, it creates a voltage difference across its terminals, which is a potential difference that causes charges to flow through the circuit.
emf:
The electromotive force (emf) is the potential difference between two points in an electric circuit when a voltage is applied. It is measured in volts (V) and is a measure of the driving force behind the flow of charge in a circuit. In simpler terms, emf is the "pull" that makes a battery or other source of electrical energy push or pull charges through a circuit.
Internal Resistance:
Internal resistance is the opposition to the flow of electric current within a conductor or component of an electrical circuit. It is an intrinsic property of the conductor that depends on its material and geometry. Internal resistance reduces the effective resistance of the circuit, meaning that the current flow is not as easy through it.
Examples:
A battery is an example of a cell that generates a potential difference and hence creates an emf.
A circuit with multiple cells connected in series has a total resistance that is equal to the sum of the individual resistances of the cells.
A wire with a high internal resistance will have a lower current flow compared to a wire with a lower internal resistance