An electric kettle draws a
current of 4A for 2.5 min. if the
resistance of its element is 100
12, calculate the electric
energy drawn by kettle in
kilojoules *
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Answer:
Current = 4A
Resistance = 40Ω
time = 8×60 second
Heat = i
2
Rt
=16×40×8×60
=
1000
16×24×8×10
2
×1000
= 307.2 K Joules
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