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Across 2. the distance between the electrodes 4. What happens when the key is turned 7. resistance unit 8. Stops the electrical current escaping 9. the unit of measurement for electromotive force 10. the distance the spark plug screws into the cyclinder 11. This helps prevent the 'points' burning out 13. sends the electricity to the correct spark plug 15. Provides the electromotive force 16. found between the coil and the spark plug 18. found in many places to turns things on and off 19. the components which provides the spark 20. found inside the distributor

Down 1. the full name for HT 3. these are only found on old type ignition systems 5. fitted to ignition systems to stop interference 6. probably the best metal conductor 12. this ignites the fuel 14. this squirts fuel into the cylinder 17. This multiplies the battery voltage