(i) State Ohm’s law for an ohmic conductor at constant temperature.
(ii) A carbon resistor of resistance 470Ω is connected across a 9V battery of negligible internal resistance. Calculate the current that flows through the resistor.
(iii) The 470Ω resistor is replaced by a 100Ω resistor while the same battery is used. Determine the new current and find the percentage increase in current compared to part (ii).