The power rating should be noted and some diodes may require cooling to operate at their rated current. The voltage drop across the diode will fall with temperature, causing the fan to speed up. Like other series regulators, the diode will dissipate power equal to its voltage drop times the current passing through it. Voltage modification ("volt modding") The voltage a computer cooling fan receives is defined by the difference between the voltage wire (+12 V) and the ground wire (+0 V). By connecting one or both wires to a different voltage, the voltage the fan receives will be different from the default 12 V the fan was designed for. Increasing the voltage over the default 12 V can be achieved by e.g. connecting the −12 V or −5 V power line instead of the ground wire in the fan connector, and by connecting the 5 V power line in the +12 V input of the fan connector. Through this procedure, 10, 17 and 24 V voltages can be achieved, with voltages exceeding 12 V being potentially damaging to the computer fans rated at 12 V. However, the combination of modern power supplies no longer being required to provide a −5 V power line and the limited power delivery capability of the −12 V line (usually less than 1 A of current) reduces the total capacity for volt modded fans in modern systems. Connecting the +5 V power line to the +12 V input of the fan reduces the voltage the fan receives to +5 V. Some fans will not work at such low voltage at all, while some other fans may run at +5 V once they have started rotating at a reasonable speed. Another method of reducing the fan speed is by moving the 5 V wire in the classical Molex power connector in the place of the Ground wire going to the fan, thereby delivering +7 V (12 V − 5 V = 7 V) to the fan. However, this is a potentially risky method, because +5 V PSU line is intended to source current only, not sink it, so the PSU is likely to get damaged in case of load on 5 V PSU line being below the load generated by 7 V fans (e.g. when PC enters idle/sleep state). Also, the components inside the computer using +5 V power might be exposed to over 5