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How much power is consumed by a 12-V incandescent lamp if it draws 150 mA of current when lit? What is
its resistance under this condition?​


Sagot :

Given: V = 12V

I = 0.15A

mA ------> A

150mA × 1A / 1000mA = 0.15A

Unknown: P = ?

R = ?

Formula: P = VI

R = V²/P

Solution: P = VI

= (12V)(0.15A)

= 1.8W

R = V²/P

= (12V)² / 1.8W

= 144V / 1.8W

= 80Ω

Final Answer: P = 1.8W

R = 80Ω

Note: S.I Unit for Power is Watts(W) and for Resistance is Ohms(Ω)