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Describe motion with signed quantities
For constant acceleration in one dimension, v=u+at and s=ut+½at². The signed area under the velocity-time graph is displacement. Distance sums the absolute travel and can exceed the magnitude of displacement after a turn.
Before this: Units, graphs and signed numbers
Connect voltage, current and resistance
For an ideal ohmic resistor at fixed temperature, V=IR. Rearrange to I=V/R or R=V/I. Power transferred to the resistor is P=VI. In a simple series circuit the same current passes through both resistors; parallel branches share voltage.
Before this: Units and rearranging equations
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