Verified answer

a) This ohm law:

Volts = Current time resistance ( V = R x I )

I = V/R there for: I = 12/10......Current = 1.2 Ampers

b) Power is volts time current

P = V x I.......P = 12 x 1.2 = 14.4 Watts

also Power = square of Current time the resistance ..P = 1.2 x 1.2 x 10 = 14.4 Watts

The resistance of a 10 ohm light bulb at cold (without light up) is much different when it is light up.

As the filament becomes red hot,the resistance becomes 2 times or more compare to its cold resistance. We can calculate the current flow for a 10 ohms RESISTOR, but not a light bulb by only giving the resistance of a cold filament.

Therefore,your question is unjustified.

I = e/r = 12/10 = 1.2 A

P = i*e = 1.2*12 = 14.4 W

= I^2R (1.44)(10) = 14.4 W