The potential difference between two points is 20V .what does it mean
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This means that each coulomb exerted/released 20 Joules of energy while going through the resistor.
Explanation:
As Voltage= Work done (J)/ Unit charge (Coulomb), this means that if the potential difference (or Voltage) is k Volts, then each coulomb of charge will exert/use k Joules of energy for going through the resistance.
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