Use app×
Join Bloom Tuition
One on One Online Tuition
JEE MAIN 2025 Foundation Course
NEET 2025 Foundation Course
CLASS 12 FOUNDATION COURSE
CLASS 10 FOUNDATION COURSE
CLASS 9 FOUNDATION COURSE
CLASS 8 FOUNDATION COURSE
0 votes
534 views
in Chemistry by (72.3k points)

All kinds of laws govern our everyday life. Traffic laws tell that you have to stop at stop signs. Government laws demand that you have to pay income tax on your salary/income, etc. Even scientific laws apply to everyday life. For example, law of gravity forces us to move on earth and we cannot move in the air. Another set of scientific laws that affect our everyday life are the laws of thermodynamics. For example, first law of thermodynamics states that energy can neither be created nor be destroyed but it can be converted from one form to another. This is also sometimes referred to as law of conservation of energy. 

Now answer the following questions. 

(i) How is first law of thermodynamics applicable to an electrical fan or a heater? 

(ii) How does first law of thermodynamics apply to a hydroelectric power plant? 

(iii) If a stone at a height falls, it hits the objects or breaks our head. How does first law of thermodynamics apply here?

1 Answer

0 votes
by (71.4k points)
selected by
 
Best answer

(i) In an electrical fan, the electrical energy is converted into mechanical work that moves the blades. In a heater, electrical energy is converted into heat energy. 

(ii) Running water of the river or lake has kinetic energy. By stopping the flow in a dam, the kinetic energy is converted into potential energy. When water is allowed to fall on the turbine, it is converted into kinetic energy which is then converted into mechanical work that runs the turbine and ultimately converted into electrical energy. 

(iii) The stone at a height has potential energy. When it falls its potential energy is converted into kinetic energy and hence is associated with a force that hits the object or breaks our head.

Welcome to Sarthaks eConnect: A unique platform where students can interact with teachers/experts/students to get solutions to their queries. Students (upto class 10+2) preparing for All Government Exams, CBSE Board Exam, ICSE Board Exam, State Board Exam, JEE (Mains+Advance) and NEET can ask questions from any subject and get quick answers by subject teachers/ experts/mentors/students.

Categories

...