The current in the flashlight bulb is 0.28 A at 3.5 V. Find the resistance of the bulb’s filament.
| February 26, 2021 | education
To find the required resistance of the filament of a light bulb of a given flashlight, apply Ohm’s law: I = U / R and R = U / I.
Values of variables: I – current in the light bulb (I = 0.28 A); U – voltage (U = 3.5 V).
Let’s do the calculation: R = U / I = 3.5 / 0.28 = 12.5 Ohm.
Answer: The resistance of the filament of the bulb of the taken flashlight is 12.5 ohms.
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