The heat generation of a power supply depends on its power consumption, just like other electronic equipment. The heat generation can be calculated as follows.

1 [Ws] = 1 [J]

It can also be expressed in "cal" as follows.

1 [Ws] = 0.239 [cal]

For example, the power consumption of a power supply shown in the specification below can be calculated as follows.

[Spec]
　　 Output voltage: 5V
　　 ・Output current: 10A
　　 ・Efficiency: 80%
　　 ・Operating time: 1hr

Internal Power Loss: P　＝　Active Power - Output Power
                  ＝(Output Voltage x Output Current / Efficiency)- (Output Voltage x Output Current)
                  ＝　（5×10/0.8）　－　（5×10）
                  ＝　12.5[W]

Heat Generation: J = Internal Power Loss [W] x Time [s]
                  ＝　12.5　×　3,600
                  ＝　45,000[J]
                  ＝　45,000　×　0.239
                  ＝　10,755[cal]

*Please refer to the “Characteristics Data” section of each product page for information on power supply efficiency.