Is LRNRS Free Battles really free?

Yes! Free Battles are completely free forever. No hidden costs, no paid tiers required. You can create unlimited battles with 1-4 questions each.

How is LRNRS different from Kahoot?

LRNRS is faster (60-second setup vs multiple minutes), completely free (no paid tiers for core features), requires no sign-up for teachers or students, and has AI that generates better technical questions with proper calculations and LaTeX support.

Do students need accounts to join?

No - students just enter a join code and their name (or nickname). No email, no password, no account required. Privacy-first design.

Can I use LRNRS for formative assessment?

Yes! After each battle, you receive an email with student rankings, question-by-question accuracy stats, and which questions students found most difficult. Perfect for identifying gaps in understanding.

Live Quiz Battles for

Thermodynamics Classes

Run live thermodynamics quiz battles in about 60 seconds. Supports LaTeX for state functions, entropy equations, and cycle efficiency. Taken by ME, ChE, and AE students — works for all of them.

No student accounts • Unlimited participants free • Manual creation free forever

Why Thermo Instructors Use LRNRS

Equation rendering for thermo notation

Write questions with proper thermodynamic notation — $\eta_{th} = 1 - Q_L/Q_H$ , state functions, partial derivatives — and students read them correctly on their own devices.

P-v and T-s diagram questions

Upload a P-v or T-s diagram image and ask students to identify the cycle, locate states, or read off values. Images display on every student's device — no projector required.

Works for ME, ChE, and AE courses

Thermodynamics is taught across multiple departments with slightly different emphasis. Write your questions for your specific course — steam tables vs. ideal gas emphasis, Rankine vs. Brayton cycles.

Identify conceptual gaps before exams

Thermo has a lot of conceptual content students can memorize shallowly. A quick battle reveals whether students actually understand the second law or just know how to recite it.

Topics Instructors Use LRNRS For

First law: closed and open systems
Second law and entropy
Carnot cycle efficiency
Rankine and Brayton cycles
Phase diagrams and steam tables
Ideal gas law and equations of state
Enthalpy, internal energy, specific heats
Exergy and irreversibility

Example Battle: Rankine Cycle Review

4-question battle, 90 seconds each

Q1 — Conceptual

Which process in the Rankine cycle is isentropic? (4 labeled options from a T-s diagram image)

Q2 — Calculation setup

Given steam enters the turbine at 3 MPa, 400°C and exits at 50 kPa — which equation gives turbine work?

Q3 — Second law

Which modification to the Rankine cycle improves efficiency by reducing irreversibility in the condenser?

Q4 — Conceptual

Why is the pump work in a Rankine cycle much smaller than the turbine work?

Run your first thermo battle today

Free to start. Write a few first-law or entropy questions, launch, and find out who actually understood the cycle analysis.