(a(i))[2]
Calculate the heater's resistance.
(a(ii))[3]
The heater uses a wire with cross-sectional area $2.0\times10^{-7}\,\text{m}^2$ and resistivity $1.1\times10^{-6}\,\Omega\text{m}$. Use your answer from (i) to find the wire's length.
(b(i))[1]
The supply voltage is altered to $110\,\text{V}$. Calculate the heater's power output at this voltage, assuming that the wire's resistance does not change.
(b(ii))[2]
State and explain quantitatively one change that could be made to the heater wire so that it gives the same power as in (a).