Internal Resistance

Hamilton on a calm night. The importance of electricity to our everyday lives is obvious. A hundred years ago this would have been in darkness.

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9.4 - Internal Resistance and emf

To know that real cells (batteries) have internal resistance and that this can be modelled by adding a resistor in series.
To understand that the effect of this that the voltage of the cell drops as the current increases.
To be able to determine the internal resistance of a cell experimentally.
To understand the difference between "terminal" voltage and emf

Physics Aviary Problem

To know that there exists a force between two charges and that force can be either attractive or repulsive.
To know and be able to use the inverse-square law of electrostatics (Coloumb's Law)
To appreciate the similarities and differences between Coulomb's Law and Gravitation.
To be able to solve problems involving two charged particles.