Determine the resistance of an electric lamp, the current strength of which is 0.5 A at a voltage of 120 V.

Initial data: I (value of the current in the electric lamp) = 0.5 A; U (voltage value) = 120 V.

To determine the resistance of a given electric lamp, we use Ohm’s law for a section of the circuit:

I = U / R and R = U / I.

Let’s do the calculation:

R = 120 / 0.5 = 240 ohms.

Answer: The resistance of this electric lamp is 240 ohms.