Watch & Learn (10 minutes)

Video: "Ethereum Gas Explained" – Finematics (8 min)

Link:

Alternative: "What is Gas in Ethereum?" – Simply Explained (5 min)

Link:

While watching, note:

1. What happens if you set gas limit too low?
2. Why do complex contracts cost more gas?
3. How can you reduce gas costs?

Post-Video Discussion (5 minutes)

Questions:

1. What happens if you set gas limit too low?
• Transaction fails (runs out of gas)
• You still pay for gas used up to limit
• Failed transactions still cost money!
2. Why do complex contracts cost more gas?
• More operations (storage writes, loops, external calls)
• Each operation consumes gas
3. How can you reduce gas costs?
• Use Layer 2 (Arbitrum, Optimism, Polygon)
• Transact during off-peak hours
• Use efficient dApps (optimized contracts)
• Bundle transactions (when possible)