AP EAMCET · PHYSICS · Current Electricity
An electric kettle takes 4 A current at 220 V. If the entire electric energy is converted into heat energy, then the time (in minutes) taken to increase the temperature of 1 kg of water from \(34^{\circ} \mathrm{C}\) to \(100^{\circ} \mathrm{C}\) is
- A \(7.50\)
- B \(4.50\)
- C \(5.25\)
- D \(6.25\)
Answer & Solution
Correct Answer
(C) \(5.25\)
Step-by-step Solution
Detailed explanation
\(\Delta T = 100^{\circ} \mathrm{C} - 34^{\circ} \mathrm{C} = 66^{\circ} \mathrm{C}\) \(V I t = m c \Delta T\) \(220 \, \mathrm{V} \times 4 \, \mathrm{A} \times t = 1 \, \mathrm{kg} \times 4200 \, \mathrm{J\,kg^{-1}\,^{\circ}C^{-1}} \times 66 \, ^{\circ}\mathrm{C}\)…
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