On the base of the light bulb it is written: “3.5 V; 0.28 A “. Find the coil resistance of the lamp.
| April 1, 2021 | education
Initial data: U (voltage, at the ends of the bulb spiral) = 3.5 V; I (the current for which the light bulb is designed) = 0.28 A.
The resistance of the bulb spiral can be calculated by dividing the voltage at the ends of the bulb by the current in it (Ohm’s law for a section of the circuit): R = U / I = 3.5 / 0.28 = 12.5 Ohm.
Answer: The resistance of the lamp spiral is 12.5 ohms.
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