For example, I need to know how large the I current is. According to the formula I = R / u, u is known as 220 V, R, R represents resistance

For example, I need to know how large the I current is. According to the formula I = R / u, u is known as 220 V, R, R represents resistance

In your given formula, you must know two known data to find an unknown number
If you know u is 220 V and R doesn't, you can't get the current
If you know the power, you can calculate the current as long as you know the voltage. Remember, the current calculated with the rated power is the rated current
Thank you for your question

Calculation formula of 220 v current? How large circuit breaker is used for 2000 W? How many square wires are used?
380V current calculation formula? What is the size of circuit breaker for 50KW? What is the size of thermal protection? How many square wires?

What is the load? Is it a motor? Triangle connection or star connection. If it is a motor, 250A circuit breaker, 150A through type electronic motor protector, 16 square copper core wires and six [star angle start]

What is the meaning of 3N ~ 50hz380 / 220V in architectural electrical drawings

3N means three fire and one zero, and "~ 50 Hz" means alternating current with frequency of 50 Hz. 380 / 220 V means that two kinds of alternating voltage, 380V and 220 V, can be obtained in this circuit. Three fire and one zero connection method can only use one fire and one zero, and three fire and one zero connection method can also be used. Therefore, two kinds of alternating voltage can be obtained, The three-phase four wire power supply (three-phase one zero) is used because it is connected with the zero wire at 220 v. the three-phase power supply has three live wires, which are evenly distributed, and the single line load is reduced after the power is equally divided. It is suitable for high-power electrical appliances. You can apply to the power supply department for installing three-phase power supply

What is the current of 220 V commercial power supply? What is the meaning of 50 Hz?

The quality of electric energy includes voltage and frequency. 220 V is a phase to ground voltage, 50 Hz is the change frequency of alternating current, and its cycle is 1 / 50 = 0.02 seconds. The current of the power supply depends on the sum of the power of your total electrical equipment in operation. If you use 1 electric wind for 1300W, 1 TV for 100W, and lighting for 40W, then your power consumption is 1440w