A kind of energy saving lamp used in 200V circuit, the rated power is 1W, the current through it is calculated

A kind of energy saving lamp used in 200V circuit, the rated power is 1W, the current through it is calculated


1 / 200 = 0.005 a
In fact, there is inductance in the circuit of energy-saving lamp, and the power factor may be less than 0.8,
Therefore, the rated current is about 0.005/0.8 = 0.00625a
The above two currents are not through the energy saving lamp, but through the energy saving lamp circuit



There is a 40W incandescent lamp in the 220 V AC, to find the current and resistance of the lamp?


Current 0.18a
Resistance 1210 ohm