- Sep 28, 2017 -
A variable resistor for partial pressure. On the exposed resistor, squeeze one to two removable metal contacts. The contact position determines the resistance between any one end of the resistor and the contact point. The terminal voltage and current have a definite function relation, which embodies the power conversion to other forms of the capacity of the two-terminal devices, with the letter R to represent the unit is ohm ω. Actual devices such as bulbs, electric wires, resistors and so on can be expressed as resistor components.