2400 C of electricity flows through the tile spiral every 2 minutes. Determine the resistance of the filament if the voltage on the lamp is 220V.
Initial data: q (amount of electricity passed through the spiral) = 2400 C; t (transit time for a given amount of electricity) = 2 minutes (120 s); U (effective voltage) = 220 V.
1) Calculate the current in the coil: I = q / t = 2400/120 = 20 A.
2) Determine the required resistance: R = U / I = 220/20 = 11 Ohm.
Answer: The resistance should be 11 ohms.
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