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    Finding appropriate source for the electrical load

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    Have four circuits. One takes 9Vdc, two 5Vdc, and last one takes 12Vdc. Have variable transformer for source. How do I calculate or choose the voltage needed to run all four circuits with out blowing them all up, and at the same time run each circuit by themselves or two at a time or three, etc. How do I know how much current the source needs and where do I place leads to measure current and voltage for each individual circuit?

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    Solution Preview

    Find the resistance of each of the loads by connecting a multimeter to the leads of the eqipment. Now find V/R for each device, which gives the value of the current each of them needs.

    To run all the circuits at the same time, the source must be able to ...

    Solution Summary

    Solution with all explanations and mathematical steps. The appropriate source for the electrical loads are given. The voltages are analyzed.