Electricity & Magnetism
Circuits
Current, resistance and the power a circuit draws
4 skills · Last skill is Premium
Circuits cover Ohm's law, series and parallel resistors, electrical power, and Kirchhoff's junction and loop rules.
Skills in this topic
Ohm's Law & Resistance
Relate voltage, current and resistance, and find resistance from a wire's dimensions
Series & Parallel
Combine resistors in series and in parallel, and split the current between branches
Electrical Power
Find power three ways, and the energy in kilowatt hours a device uses
Kirchhoff's Rules
Apply the junction and loop rules to a circuit with two sources
Exam paths that include this topic
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