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These resistors are said to be in **series**, and
as indicated, it is possible to consider them as one single equivalent
resistor
*R*_{ eq} . To find this equivalent resistor,
we exploit the fact from energy conservation that
*V*_{ac} = *V*_{ab} + *V*_{bc} , which using Ohm's law (17.3) becomes

IR_{ eq} = IR_{1} + IR_{2} R_{ eq} = R_{1} + R_{2}.
| (7) |

R_{eq} = R_{1} + R_{2} +...+ R_{N}.
| (8) |

10/9/1997