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An electric kettle takes 4 A current at 220 V. How much time will it take to boil 1 kg of water from room temperature 20oC ? The temperature of boiling water is 100oC
- a)6.4 minutes
- b)6.3 minutes
- c)12.6 minutes
- d)12.8 minutes
Correct answer is option 'B'. Can you explain this answer?
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An electric kettle takes 4 A current at 220 V. How much time will it t...
Given:
Current (I) = 4 A
Voltage (V) = 220 V
Mass of water (m) = 1 kg
Room temperature (T1) = 20°C
Boiling point of water (T2) = 100°C
We know that the heat required to raise the temperature of m kg water from T1 to T2 can be calculated using the formula:
Heat (Q) = m × s × ΔT
where s is the specific heat capacity of water and ΔT is the change in temperature (T2 - T1).
For water, s = 4200 J/kg°C
So, Q = m × 4200 × (100 - 20) = 336000 J
We also know that the power (P) of the electric kettle is given by:
P = VI
So, P = 220 × 4 = 880 W
The time (t) taken to heat the water can be calculated using the formula:
Q = Pt
So, t = Q/P = 336000/880 ≈ 381.81 s ≈ 6.36 minutes
Therefore, the correct answer is option (B) 6.3 minutes.
Current (I) = 4 A
Voltage (V) = 220 V
Mass of water (m) = 1 kg
Room temperature (T1) = 20°C
Boiling point of water (T2) = 100°C
We know that the heat required to raise the temperature of m kg water from T1 to T2 can be calculated using the formula:
Heat (Q) = m × s × ΔT
where s is the specific heat capacity of water and ΔT is the change in temperature (T2 - T1).
For water, s = 4200 J/kg°C
So, Q = m × 4200 × (100 - 20) = 336000 J
We also know that the power (P) of the electric kettle is given by:
P = VI
So, P = 220 × 4 = 880 W
The time (t) taken to heat the water can be calculated using the formula:
Q = Pt
So, t = Q/P = 336000/880 ≈ 381.81 s ≈ 6.36 minutes
Therefore, the correct answer is option (B) 6.3 minutes.
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An electric kettle takes 4 A current at 220 V. How much time will it take to boil 1 kg of water from room temperature 20oC ? The temperature of boiling water is 100oCa)6.4 minutesb)6.3 minutesc)12.6 minutesd)12.8 minutesCorrect answer is option 'B'. Can you explain this answer?
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An electric kettle takes 4 A current at 220 V. How much time will it take to boil 1 kg of water from room temperature 20oC ? The temperature of boiling water is 100oCa)6.4 minutesb)6.3 minutesc)12.6 minutesd)12.8 minutesCorrect answer is option 'B'. Can you explain this answer? for NEET 2024 is part of NEET preparation. The Question and answers have been prepared according to the NEET exam syllabus. Information about An electric kettle takes 4 A current at 220 V. How much time will it take to boil 1 kg of water from room temperature 20oC ? The temperature of boiling water is 100oCa)6.4 minutesb)6.3 minutesc)12.6 minutesd)12.8 minutesCorrect answer is option 'B'. Can you explain this answer? covers all topics & solutions for NEET 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for An electric kettle takes 4 A current at 220 V. How much time will it take to boil 1 kg of water from room temperature 20oC ? The temperature of boiling water is 100oCa)6.4 minutesb)6.3 minutesc)12.6 minutesd)12.8 minutesCorrect answer is option 'B'. Can you explain this answer?.
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