The current in the coil of the electric lamp is 0.5 A, the voltage at its ends is 2V. What is the resistance of the coil?

To find the resistance of the spiral of the used electric lamp, apply Ohm’s law: I = U / R, from where we express: R = U / I.

Variables: U – voltage at the ends of the spiral (U = 2 V); I – current strength (I = 0.5 A).

Let’s make a calculation: R = U / I = 2 / 0.5 = 4 ohms.

Answer: The coil resistance of the used electric lamp is 4 ohms.