About Resistance / load

Resistance is the ability to resist external forces. The word “load” has the same meaning as resistance, and the word “load” is also used when straining muscles with the aim of increasing muscle strength during muscle training. Resistances and loads in industrial products control the current flowing in electrical circuits. In a DC circuit, the resistance R is represented by R=V/I from the formula V=IR. If the voltage between points A and B is V and the current flowing is I, the resistance between becomes R. The unit is Ω (ohm). From a different point of view, if you want to set the voltage between points A and B to V and the current value to I, then the value of R can be determined by V/I. In alternating current circuits, resistance is called impedance and is represented by the symbol Z. The unit is also Ω (Ohm). Replacing R in a DC circuit with Z, it can be expressed as V=IZ. In AC circuits, the impedance component of coils and capacitors is called reactance. In the case of coils, it is inductive reactance, and in the case of capacitors, it is capacitive reactance. Impedance calculations are complicated in AC circuits with coils and capacitors, and include complex numbers expressed as phase difference components from resistor R.