Question

Convert the following-
1kcal=?
A. 1000 cal
B. 100 cal
C. 2800 cal
D. All

Answer 1

Hint: Define kilocalorie. Define calorie. Kilocalorie is a unit of energy. Define metric prefixes that give different values depending on the prefix we use before the unit. Find out what value defines the prefix kilo.

Complete step by step answer:
The kilocalorie is a unit of energy. Kilocalorie is the amount of energy required to increase the temperature of one litre or one kilogram of water by one degree Celsius.
In the metric prefix system we use different prefixes to define larger and smaller values. Kilo is one such prefix. The symbol for kilo is k. Kilo can be defined in the base 10 as ${{10}^{3}}$ .
Calorie is a unit of energy. One calorie is a very low energy. Calorie is mainly used in the food industry or nutrition industry. A calorie can be defined as the energy required to raise the temperature of one gram of water by one degree.
So, we can define a kilocalorie as ${{10}^{3}}$times a calorie.
So,
$\begin{align}
  & 1kcal={{10}^{3}}cal \\
 & 1kcal=1000cal \\
\end{align}$
One kilocalorie is equal to 1000 calorie.
The correct option is (A).

Note: One calorie is equal to 4.184 joules.
Energy can be defined as a quantity that must be transferred to a system if we need to work. Energy is a conserved quantity. Energy can neither be created nor be destroyed. We only can transform energy from one form to another. This is known as the law of conservation of energy. There are many units of energy. SI unit of energy is joule.
Energy and work done has the same units.