When is the potential difference between two points said to be $1$ volt?

  • A
    When $1$ joule of work is done to move $1$ coulomb of charge.
  • B
    When $1$ coulomb of work is done to move $1$ joule of charge.
  • C
    When $1$ ampere of current flows for $1$ second.
  • D
    When $1$ watt of power is consumed for $1$ second.

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