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![Grade 11 physics: electric power] Question about task c: If P=UI=RI^2=U^2/R, why can't we use R=U^2/P to find R? That would give the wrong answer R=(115V)^2/667W=19.8 Ohms. I just can't seem to Grade 11 physics: electric power] Question about task c: If P=UI=RI^2=U^2/R, why can't we use R=U^2/P to find R? That would give the wrong answer R=(115V)^2/667W=19.8 Ohms. I just can't seem to](https://preview.redd.it/grade-11-physics-electric-power-question-about-task-c-if-p-v0-9m7juuh6hyia1.png?auto=webp&s=6df1e12b4b9aa2402b89f7f1c2a5eb3db319340d)
Grade 11 physics: electric power] Question about task c: If P=UI=RI^2=U^2/R, why can't we use R=U^2/P to find R? That would give the wrong answer R=(115V)^2/667W=19.8 Ohms. I just can't seem to
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SOLVED: 'In Emily's physics class, she had to solve the equation 9 = 12at2 + ut for u. Each step of her work is shown below. Use the drop-down menus to explain
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