Electromotive Force - The amount of energy transferred by a source, to each unit of charge that passes through it., Ohmic Conductor - A conductor for which the current flow is directly proportional to the potential difference across it, when under constant physical conditions., Resistance - A measure of how difficult it is for current to flow through a material., Potential Divider - A method of splitting a potential difference, by connecting two resistors in series. The total potential difference is split in the ratio of their resistances., Resistors in Parallel - The potential difference across resistors connected in parallel is identical for each resistor. The current is split between the resistors. The total resistance is equal to the inverse of the sum of the inverses of the resistances of the resistors., Resistors in Series - The current through resistors connected in series is identical for each resistor. The potential difference is split in the ratio of their resistances. The total resistance is equal to the sum of the resistances of the resistors., Terminal Potential Difference - The potential difference across the terminals of a power source. It is equal to the source’s emf minus any voltage drop over the source’s internal resistance, Current - The rate of flow of charge in a circuit., Internal Resistance - The resistance to the flow of charge within a source. Internal resistance results in energy being dissipated within the source., Ohm’s Law - The current and potential difference through an ohmic conductor held under constant physical conditions are directly proportional, with the The current and potential difference through an ohmic conductor held under constant physical conditions are directly proportional, with the constant of proportionality being resistance. of proportionality being resistance.,

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