Ohm's law: V = IR
Change the current and the resistance and watch the voltage update, with the V–I graph of a resistor that obeys Ohm's law.
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Questions students ask
Does every component obey Ohm's law?
No. A resistor at constant temperature does, giving a straight line through the origin. A filament lamp heats up and its resistance rises; a diode only conducts one way.
What formula does it use?
V = IR: voltage (volts) = current (amps) × resistance (ohms).
Free notes on Ohm's law
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