I have read through the book "Electronics for Dummies" and I am still having trouble finding the unknown values for different circuits. I have learned some things about series and parallel circuits. My point that I am stuck on now is I am given a parallel circuit which has V=12 volts I=300 mA R1=50 Ohms what is R2? and what is P1? given the formula P=I squared X R but I only have the value for R1 which is 50 Ohms. Also when I calculate 12 volts X .300 mA I get 3.6 the book gives the answer of 2.88 watts. I will upload the circuit.
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