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find the potential difference when the current is 5 amps and the resistance is 10ohms.

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The Potential Difference is the drop in voltage that occurs across a resistor as current flows through it. In a circuit, Potential Difference or Voltage (V) = Current (I) * Resistance(R), or to abbreviate V=I*R. In this case, I=5 amps and R=10 ohms, so V= I*R= 5 amps*10 ohms=50 volts.