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A closed circuit lets electricity flow; an open circuit stops it.
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Measures voltage, current, and resistance in real time.
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Opens or closes a circuit to turn things on or off.
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Use a multimeter to verify current direction in a diode or battery.
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Light Emitting Diodes glow when current flows through in the correct direction.
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Common connection point for electrical flow to return safely.
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Some components like LEDs and batteries work only in one direction.
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Breaks the circuit if too much current flows.
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Controls how much current flows in a circuit.