(a) Negative values for R have no physical significance, hence P is not plotted for negative values of R.
(b) Draw up a table of values:
(c) Check what happens between `R = 0` and `R = 1` ie.
when `R = 0.25`, `P = 44.4``R = 0.50`, `P = 50 `
`R = 0.75`, `P = 48`
Note the axes are labelled with R (resistance) and P (power).
(i) The maximum power of `50\ "W"` occurs when resistance `R = 0.5\ "W"`
(ii) P decreases as R increases beyond `0.5\ "W"`
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