Name                         Symbol           Unit          Definition

Potential different         V                V (volt)     The electrical potential energy for    
                                                                                  each coulomb of charge.
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Current                        I                 A(ampere)       The rate of charge flow.

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Resistance                   R               ohm                 The opposition to current flow.

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  Power                      P              W(watts)      The rate at which electrical energy
                                                                    is passed on the various circuit load.
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                                                                                                  .