A MOSFET actively controlled to act as a rectifier—actively turned on to allow current in one direction but actively turned off to block current from flowing the other direction—is sometimes called an ideal diode. Using ideal diodes rather than a standard diodes for solar electric panel bypass, reverse-battery protection, or in a bridge rectifier reduces the amount of power dissipated in the diodes, improving efficiency and reducing the size of the circuit board and the weight of the heat sink required to deal with the power dissipation.[3][4][5][6][7][8]