If a 40v200w arc lamp is to be connected to a 220V lighting circuit, the R of series resistance should be several ohm

If a 40v200w arc lamp is to be connected to a 220V lighting circuit, the R of series resistance should be several ohm

According to the rated voltage and power of lighting, the current is calculated, and then the total resistance is calculated with the current of 220 v

A water heater with rated power of 800W and rated voltage of 220V is used to calculate the resistance of the water heater. If the water heater is connected to a circuit with voltage of 110V, the output power of the water heater is calculated

R1 = 220 △ 800 △ 220 = 60 Ω; r = = 110 △ 800 △ 110 = 15.13 Ω

Is 380V voltage connected to 2 wires, and can it connect to the electric lamp of 220V?

380V is the voltage between the three-phase neutral line and the line, so no matter which two lines you use, they are 380V. If you want to connect the 220 V lamp, you need to use one of the three phases and then connect a zero line, so that is 220 v

What is the power of the lamp with voltage of 220 V and power of 60 W connected to the circuit with voltage of 380 V? What will happen

The power is about 100W, and the bulb will be over current (much brighter than 220V) and burned