The rated power of an electric furnace is 1.1KW, and the rated voltage is 220V. When it is connected to a certain circuit, the measured current passing through it is 4A? As shown in the title Ask: (1) what is the resistance of the furnace? (2) what is the actual power of the furnace?

The rated power of an electric furnace is 1.1KW, and the rated voltage is 220V. When it is connected to a certain circuit, the measured current passing through it is 4A? As shown in the title Ask: (1) what is the resistance of the furnace? (2) what is the actual power of the furnace?

According to the rated power and voltage, the rated current of the furnace is 1100 / 220 = 5a, the resistance is r = u ^ 2 / P = (220 * 220) / 1100 = 44 ohm, and the actual power is p = I ^ 2 * r = 4 * 4 * 44 = 704 watts