How much current flows through a 4 ohm resistor that is dissipating 36 watts of power?
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The SI unit of power is the watt, where 1 watt = 1 joule per second. Back to our circuit! To use the power rule (P = I × V), we need to know both the current through the resistor, and the voltage across the resistor. First, we use Ohm's law ( V = I × R ), to find the current through the resistor.
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