How will the power consumed by an electric lamp change if, without changing its electrical resistance
| June 21, 2021 | education
How will the power consumed by an electric lamp change if, without changing its electrical resistance, reduce the voltage across it by 3 times?
U2 = U1 / 3.
R2 = R1 = R.
N2 / N1 -?
The power of the electric current N is determined by the formula: N = U ^ 2 / R, where U is the voltage at the ends of the conductor, R is the resistance of the conductor.
N1 = U1 ^ 2 / R.
N2 = U2 ^ 2 / R = (U1 / 3) ^ 2 / R = U1 ^ 2/9 * R = N1 / 9.
Answer: when the voltage is reduced by 3 times, the power of the light bulb will decrease by 9 times N2 = N1 / 9.
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