Power = (voltage) x (current) = (120) x (0.042) = 5.04 watts
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1.7amp
100/220 = .45A or 450 mA
No, they overheat and chip out a draws too much current.
I have no idea
The voltage of a battery goes as the current times the resistance (V=IR). Because the voltage is being held constant, the resistor that draws the most current will have the lower resistance.
Yes. It draws less current.
very low current
A light doesn't output current, it "draws" current based on voltage and its resistance. Voltage = Current x Resistance or Current = Voltage / Resistance. (Ohm's Law)
No way of knowing w/o knowing the voltage.
The formula you are looking for is W = I x E.
By Ohm's Law Voltage = Current x Resistance R = V / I = 120 / 12 = 10 Ohms