Physics

First Law of Thermodynamics

Apply ΔU = Q − W to find internal energy change, heat added, or work done.

Live Calculator · Step-by-Step · Physics
Inputs
Sign Conventions:
Q > 0: heat added TO system  |  Q < 0: heat removed FROM system
W > 0: work done BY system  |  W < 0: work done ON system
Result
Result
Enter values and calculate.

Step-by-Step Work

Your explanation will appear here.

System Energy Diagram
Put It Into Practice

The calculator shows the steps — a quiz proves you can do them on your own.

Stuck on Physics? Get 1-on-1 help

Alexander tutors all math and CS levels — $55/session, free consultation.