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5) Four resistors are connected purely in series to a 34 volt battery. Three of the resistors are 4 ohms, 7 ohms, and 12 ohms, but the fourth is not initially known. The power produced by the battery is 21 Watts. What is the power dissipated from the fourth, unknown resistor, in Watts?

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  • 2 months ago

    34*i = 21W OR, i = 21/34

    (21/34)² *(4+7+12) = 8.774W

    21 - 8.774 = 12.226W <<<<<

    R is about 32Ω

    Check

    (21/34)²*(32+4+7+12) = 20.98W

    The unknown resistance is about 32.05 Ω

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