1.

theLitclieenergydrawnbythekettle1240 k.J]raws an energy of 45 kJ in 4 minutes, when the current flowing through its element15.2 Ί!in kilojoules.2. A soldering rod dis 6 A. Calculate the resistance of its heating element.

Answer»

t=240s

A=6

H=45000

H=I2Rt

​45000=36 x R x 240

R=5.20



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