# physics help please?

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?

### 1 Answer

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- oldschoolLv 72 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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