7 A 4700 F capacitor has a p.d. of 12V across its terminals. It is connected to a resistor and the charge leaks away through the resistor in 2.5s. a Calculate the energy stored on the capacitor. b Calculate the charge stored on the capacitor. * Estimate the average current through the resistor. d Estimate the resistance of the resistor. e Suggest why the last two quantities can only be estimates.