Joule’s law of heating states that the heat produced in a resistor is directly proportional to three factors: (i) the square of the current for a given resistance, (ii) the resistance for a given current, and (iii) the time for which the current flows through the resistor.
What does Joule’s law of heating state, and how is heat production in a resistor related to current, resistance, and time?
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Joule’s law of heating states that the heat produced in a resistor is directly proportional to the square of the current (I), the resistance (R), and the time (t). Mathematically, it is expressed as Q = I²Rt, where Q is the heat produced. This law emphasizes the significance of current and resistance in determining heat generation. Higher current or resistance leads to increased heat production. Additionally, the duration of current flow, represented by time (t), influences the total heat generated. Joule’s law is fundamental in understanding and managing heat dissipation in electrical circuits and devices.