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A soldering iron draws an energy of 43200J in 4min, when the current flowing through its element is 6A, calculate the resistance of its heating element.

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Energy draw E = 43200J,

t = 4min. = (4 x 60)s.

I = 6A

R = E/I2t = 43200/(6 x 6 x (4 x 60) = 5Ω

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