A bridge rectifier consists of four ideal diodes A, B, C, and D, connected as shown in the figure below.
An alternating supply is applied between the terminals X and Y.
The variation with time 
of the potential difference 
across the load resistor R is shown in the graph below.
The load resistor R has resistance 
. Use the graph above to determine the mean power dissipated in the resistor R.
.
