Across
- 2. What do you see when the circuit is connected with the battery?
- 3. How many minutes does it take to etch the plate?
- 5. What is the source of energy?
- 7. What stops the whole plate being etched?
Down
- 1. Which terminal on the battery does the tin plate connect to?
- 4. What is the acid that's used?
- 6. What type of metal plate is being etched?