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There is no such thing as 'resistance across' a load! The correct term is 'resistance of a load'.

To answer your question, it depends on how the loads are connected. If they are connected in series, for example, the total resistance is equal to the sum of the individual resistances. If they are connected in parallel, then you must use the following equation: 1/R = 1/R1 + 1/R2 + 1/R3 + etc.

For any other connection, you will have to work it out individually.

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