A parallel circuit with resistors of 10 ohms, 10 ohms, and 5 ohms has a total resistance of

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Total resistance of a parallel circuit can be found two ways: by using the reciprocal formula or by using the product of two resistors divided by the sum of the two resistors divided by the sum of the two and then using it again to obtain the final answer in the case of three in parallel. In this case the two 10-ohm resistors will reduce to an equivalent of 5 ohms. This leaves, then, two 5-ohm resistors in parallel, which reduce to 2.5 or half of the value of one.

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