When an alternating voltage of 220 V is applied across a device X, a current of 0.25 A flows which lags behind the voltage in phase by π/2rad. If the same voltage is applied across another device Y, the same current flows but now it is in phase with the applied voltage.
(a) Name the devices X and Y.
(b) Calculate the current flowing in the circuit when the same voltage is applied across the series combination of X and Y.