48. (a) We use P= ε 2/Req, where ( )( )()()eq12.04.007.00.12.04.012.04.00RRRRΩΩ=Ω++Ω+ΩPut P= 60.0 W and ε= 24.0 V and solve for R: R= 19.5 Ω. (b) Since P ∝Req, we must minimize Req, which means R= 0. (c) Now we must maximize Req, or set R= ∞. (d) Since Req, min
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