The electric lamp reads 100 W, 220 V. What current does such a lamp consume and what
| July 15, 2021 | education
The electric lamp reads 100 W, 220 V. What current does such a lamp consume and what is the resistance of its filament?
Initial data: P (power of an electric lamp) = 100 W; U (voltage across the filament of an electric lamp) = 220 V.
1) Determine the amount of current that passes through the lamp filament from the formula for calculating the electrical power: P = U * I and I = P / U = 100/220 ≈ 0.45 A.
2) Determine the resistance of the filament of the electric lamp: P = U * I = U ^ 2 / R and R = U2 / P = 220 ^ 2/100 = 484 Ohms.
Answer: An electric lamp draws a current of 0.45 A, and the resistance of its filament is 484 ohms.
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