Physics

posted by Anonymous

Two identical resistors are connected in parallel across a 26-V battery, which supplies them with a total power of 9.8 W. While the battery is still connected, one of the resistors is heated so that its resistance doubles. The resistance of the other resistor remains unchanged.

V^2/watts = ohms
V^2/ohms + V^2/2(ohms) = W

1. Damon

power = V^2/Req = 9.8 = 26^2/Req
so
Req = 69 ohms
so R = 2 Req = 138 Ohms

new Req:
1/Req = 1/138 + 1/276
Req = 92 Ohms

power = 26^2/92 = 7.35 Watts

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