At a voltage equal to 220 V, in an electric lamp within 0.5 minutes energy is consumed

At a voltage equal to 220 V, in an electric lamp within 0.5 minutes energy is consumed, equal to 1800 J. Determine what the current in the lamp is equal to.

Initial data: U (voltage) = 220 V; t (duration of the electric lamp) = 0.5 min (30 s); Q (consumed amount of energy) = 1800 J.

We determine the current strength in an electric lamp from the formula (Joule-Lenz law): Q = U * I * t and I = Q / (U * t).

Let’s calculate: I = 1800 / (220 * 30) ≈ 0.27 A.

Answer: The current in an electric lamp is 0.27 A.