Electrical connectors must be passed electricity, usually the voltage is very low. Commonly used in the following two electricity delivery method: dedicated to a high level of electrical contact transmission and signal contacts of parallel basket for fruits, they each method has excellent bad.
   
There are two different power transmission and signal transmission compared. The first and most obvious, is used to deliver higher current. Signaling current is usually not more than 1 Amp, will not exceed a few amps, and power transmission current can reach tens or even hundreds of amps. The second point is the temperature rise due to the Joule heat caused by the current. Similar to the Joule heat generated by the process of signal contacts with the surrounding temperature. On the contrary, the ratio of the power transmission is based on the temperature, the temperature, the corresponding ratio of current. A 30 degree temperature is often used as a current ratio of the standard.
   
Therefore, in order to meet the stability of the current rating and performance requirements, the control of Joule heating is necessary, which requires the design which must also consider the signaling to consider the transmission of electricity. In particular, the resistance of large terminals, the Joule heat is an important factor, it must be reduced to a minimum, the resistance of the contact surface must be reduced to a minimum, to minimize the heat generated. From a selection point of view, of course, high-conductivity cross-sectional area larger terminals to reduce the resistance, in addition, higher transmission voltage or to increase the contact area can also reduce the resistance of the contact part.