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14. State and derive joule’s law. An electric iron consumes energy at rate of 420w when heating is at maximum rate and 180 w when heating is at minimum. The voltage is 220V .What is the current and resistant in each case?

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Joule's law states that the heat produced in a resistor is directly proportional to the square of the current passing through it and the resistance of the resistor. Mathematically, H=I²×R, where H is the heat produced, I is the current, and R is the resistance. To find the current, I=P/V and...
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Joule's law states that the heat produced in a resistor is directly proportional to the square of the current passing through it and the resistance of the resistor. Mathematically, H=I²×R, where H is the heat produced, I is the current, and R is the resistance. To find the current, I=P/V and then use Ohm's law to find resistance R=V/I

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