The electric iron is designed for U = 220V R = 88Om T = 30 min. Find Q =? P =?
| December 7, 2020 | education
According to the Joule-Lenz law:
Q = I ^ 2 Rt = ((U ^ 2) / R) * t = 220V ^ 2 / 88Ω * 30 * 60sec = 990kJ.
Power P = U ^ 2 / R = 550 W.
Answer: Q = 990 kJ, P = 550W.
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