This document describes the basic parts and functions of a toaster. It explains that when the toaster is turned on, a variable resistor controls power to the nichrome heating wires. Pushing down the lever completes the electrical circuit, allowing current to flow and heat the wires to toast the bread. After a set time determined by a capacitor and resistor, the electromagnet releases and springs eject the toast.

1. Judith Lievens

2. History

4. Electricity in America

5. 1900 Embeddedheating

6. 1905 Nichrome (Albert Marsh)

7. 1909 First electric toaster (Frank Shailorfor General Electrics)

8. 1913 Toaster withautomatic turner (Lloyd Copeman)

9. 1919 Automaticpop-up (Charles Strite)

10. 1933 Spring loadedautomatic toaster in households

11. 1960’s Common and cheap

13. Parts Shell

14. Parts Shell -Handle

15. Parts Shell – Switch&Options

16. Parts Shell - Slots

17. Parts Bottom

18. Parts CrumbTray

19. Parts Inside Lever Plastic tab Contacts Metal tab Electromagnet Springs Selfpositioning slot PCB

20. Sowhat happens WHEN i toast my slice of bread?

21. Sowhat happens… Plug in the toaster Turn the switch Optionallypick ‘bagel’, ‘defrost’ or ‘reheat’ Place your slices of bread Push the tray down with the handle Waitor push ‘stop’ Take out yourbread Emptycrumbtray Pull out the plug Eatit!

22. Sowhat happens… Whenyou turn the switch? Variableresistor

23. Sowhat happens… Pickan extra option? Extra resistors LED

24. Sowhat happens… When I push down?

25. Sowhat happens… When I push down? Contacts close – lubicant – electrical circuit

26. Sowhat happens… When I push down? Nichromewires start toasting

27. Sowhat happens… When I push down? Electromagnet – metal tab

28. Sowhat happens… When I push down? Selfpositioning slot

29. Sowhat happens… When I push down? Selfpositioning slot

30. Sowhat happens… When I push down? Spring 1: stretches Spring 2: moves down

31. Sowhat happens… When I wait? Capacitor charges throughresistor = timer

32. Sowhat happens… When I wait? Electromagnet is cutoff and lets go

33. Sowhat happens… When I wait? Spring 1: relaxes Spring 2: stops components

34. Sowhat happens… When I wait? Plastic tab – pulled upwards – contactsbroken

35. Sowhat happens… When I wait? Power to nichromewirescutoff

36. Sowhat happens… When I wait? Selfpositioning slot

37. Sowhat happens… When I wait? Selfpositioning slot

38. Sowhat happens… When I push ‘stop’? NormalClosed ↓ Power is cutoff Electromagnet releases tray Springsrelaxes and pulls up the traywith toast Contact fornichromewires is broken …

39. Sowhat happens… When I eatmy toast?