22. i) State joules law of heating?
m) An electric iron has a rating of 750W:220V.
Calculate a) current consumed by it
b) its resistance when in use.
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This law implies the heat produced in a resistor is
- directly proportional to the square of current
- directly proportional to resistance for a given current
- directly proportional to the time for which the current flows through the resistor
H=I2 RT
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