There’s nothing like the real thing when it comes to circuits… actually connecting the wires, battery, lightbulbs, and meters yourself! But interactive simulations have their place too. PhET at hte University of Colorado Boulder has produced outstanding simulations on many topics in the various sciences, and enhance one’s study of circuits I would highly recommend their “Circuit Construction Kit” below. Many different circuits can be constructed by dragging wires, batteries, and lightbulbs, and meters can be used to measure voltage and current. The user can change the resistance of the lightbulbs and wires, and the voltage of the batteries.

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