An 8Ω resistor is connected across a battery.
(i) Calculate the current drawn from the battery when the potential difference is 12V.
(ii) If the potential difference is raised to 24V while the same resistor is used, determine the new current.
(iii) By what factor has the current changed between parts (i) and (ii)?
(iv) Determine the potential difference required to obtain a current of 3A through the same resistor.