explain?thank you veeery much :)
No, not if that isn't what you want. Energy is lost to the heat instead of going to the motor or whatever you want the power for.
Yep, about 90% of electrical power goes into heating (the heater is constructed for that, with high resistance wiring to get heat). The rest goes into visible light (glowing). For a light bulb electricity it is NOT efficient, about 90% is heat, which you do not want in that case, you just want the light
