The amount of heat during the heating of an electric furnace element is 228 kJ, with a current of 4A

The amount of heat during the heating of an electric furnace element is 228 kJ, with a current of 4A, a resistance of 30 Ohm. How long does it take to heat the furnace I = 4K = 30 Ohm Q = 288000J. Find t.

These tasks: Q (heat expended for heating an electric furnace element) = 228 kJ (288 * 10 ^ 3 J); I (current) = 4 A; R (element resistance) = 30 ohms.

To determine the heating duration of the considered element of the electric furnace, we use the formula: Q = I ^ 2 * R * t, whence t = Q / (I ^ 2 * R).

Let’s perform the calculation: t = (288 * 10 ^ 3) / (42 * 30) = 600 s or 10 minutes.

Answer: It will take 10 minutes to heat the considered element of the electric furnace.