Learning objective
Apply the laws of thermodynamics and interpret common processes.
CLASS 11 PHYSICS
Thermodynamics
Study heat, work and internal energy in macroscopic systems.
State Board to NCERT bridge
From heating a gas to tracking energy entering, leaving and stored in a system.
Tamil concept bridge
System, surroundings, heat, work enra terms-ai sign convention-udan serthu padikkavum.
GUIDED LESSON
Learn the chapter step by step
Read one concept, explain it in your own words, then connect it to the formula or situation that follows. Do not try to memorise the chapter as isolated definitions.
Define the system boundary before applying signs. Pressure, volume and temperature are state variables; heat and work are path-dependent transfers.
Tamil support: System, surroundings, heat, work enra terms-ai sign convention-udan serthu padikkavum.
Ask yourself: Can I give one everyday example of system, surroundings and state?
WORKED EXAMPLE
First law
Given: A gas receives 500 J heat and does 200 J work.
- 1Use Delta U = Q - W for work done by the system.
- 2Substitute Q = 500 J and W = 200 J.
- 3Delta U = 500 - 200.
Answer: Internal energy increases by 300 J.
FORMULA / FACT BANK
Know what each relationship means
First law
Delta U = Q - W
W is work done by the system.
Memory cue: state variables · first law · process graphs · heat engines
SELF-CHECK
Which concept should you start with?
Choose the core foundation concept for this chapter.
COMMON MISTAKES
- Do not use a formula before identifying the physical quantities and their SI units.
- Keep direction, sign convention and stated conditions visible throughout a solution.
- Check whether your answer has a sensible unit and magnitude.
REVISION PLAN
- 1. Re-read the visual summary and say each revision target aloud.
- 2. Redo the worked example without looking at the steps.
- 3. Complete the 80-question bank and revisit every incorrect explanation.
VISUAL NOTES
Thermodynamics at a glance
Thermodynamic system
Define system, surroundings and state variables.
First law
Conserve energy between heat, work and internal energy.
Processes
Compare isothermal, adiabatic and cyclic changes.
Formula / fact focus
First law
Delta U = Q - W
Last-minute memory cues
- 1. ✓state variables
- 2. ✓first law
- 3. ✓process graphs
- 4. ✓heat engines
NEXT IN THIS CHAPTER
Practise this chapter with its complete 80-question MCQ bank, then use the video and revision notes to strengthen any weak areas.