GK QUESTION#3114
Statement I: One calorie of heat energy is approximately equal to 4.2 joules of mechanical energy. Statement II: The calorie is a unit of power used to measure the rate at which energy is transferred.
Show Answer
Answer
B. Only statement I is correct
Show Explanation
Explanation
A thermochemical calorie equals 4.184 J, approximately 4.2 J. Both units measure energy regardless of whether the transfer is described as heat or work. Power is energy transferred per unit time and is measured in watts, so only Statement I is correct.