1 / 36

Unit 1

Unit 1. Lesson 2: What Makes a Circuit?. Objective: Series Circuit. By the end of this lesson you should be able to define a series circuit. Comprehension: Series Circuit. Vocabulary: Series Circuit. Electric current – a flow of electric charges

garzad
Télécharger la présentation

Unit 1

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. Unit 1 Lesson 2: What Makes a Circuit?

  2. Objective: Series Circuit • By the end of this lesson you should be able to define a series circuit.

  3. Comprehension: Series Circuit

  4. Vocabulary: Series Circuit • Electric current – a flow of electric charges • Electric circuit – a continuous pathway that can carry an electric current • Series circuit – an electric circuit with only one path for current

  5. Electric Current • Electric current – a steady flow of electric charges • Current electricity is used to power most electrical things • It is easier to control than static electricity

  6. Electric Current • Electric currents can only move along paths • It is not random • It moves continuously, as long as there is a path to follow

  7. Electric Circuit • Electric circuit – a continuous pathway that can carry an electric current • Pathways can be open or closed • Closed pathways provide usable energy

  8. Electric Circuit • Circuits need a source to provide the movement of the electrical charges • A battery is an example • Two kinds of circuits: series and parallel

  9. Series Circuit • Series Circuit – an electric circuit with only one path for current to flow through • An electric current must go all the way around for anything to work

  10. Series Circuit: Travel of the electrical current • First the current leaves the power source • Then it travels through the wire • It passes through each attached device • Finally it ends up back in the power source • This pattern repeats as long as the pathway is closed

  11. Series Circuit + + + Battery +

  12. Series Circuit • Is mostly used for simple devices • Flashlights, small lighted signs, bicycle flashers • If one part of a series does not work, the whole thing will not work • Everything attached to a series circuit is on when one thing is on

  13. Series Circuit • The more devices attached to a series circuit, the less effective each device is • Which circuit will have the brightest lights? Why?

  14. Series Circuit • Buddy share: Would it be a good idea to use a series circuit in a house? Why or why not?

  15. Comprehension Closure What is a series circuit?

  16. Exploration: Series Circuit

  17. Group Exploration: Making a Series Circuit • Your group will go to two different stations • You have a creation station as well as a writing station • You will have 10 minutes at each station • You will only rotate when the teacher tells you to

  18. Exploration Closure: Series Circuit Draw a picture of a series circuit. Label the different pieces in your picture.

  19. Comprehension: Parallel Circuit

  20. Objective: Parallel Circuit • By the end of this lesson you should be able to define a parallel circuit and tell the difference between a series and a parallel circuit.

  21. Vocabulary: Parallel Circuit • Parallel circuit – an electric circuit with two or more paths for current • Resistance – how much a material opposes, or resists, the flow of electric current • Short circuit – a flaw in a circuit that allows a large current to flow through where it isn’t wanted

  22. Check in… • Remember that a series circuit is a circuit where there is only one path for the energy to flow

  23. Parallel Circuit • Parallel circuit – an electric circuit with two or more paths for current • If one path is blocked, the charges can use another path to continue moving • It gives the electrical charges options for movement

  24. Parallel Circuit • You can put many different devices on a parallel circuit • The current is split between pathways • The current can go around an object not working • Houses and buildings are wired with parallel circuits • Adding another device does not change the capabilities of other devices

  25. Parallel Circuit + + + + + Battery +

  26. Resistance • Resistance – how much a material opposes, or resists, the flow of electrical current • The greater the resistance, the less current can pass through • Smaller wire has greater resistance than thicker wire

  27. Resistance • Which wire would be better to use? Why?

  28. Resistance = Light • In a light bulb the light is actually the resistance of the electrical current • The filaments (thin wires) in the bulb has high resistance • First the filament gets hot, then it glows

  29. Resistance = Light

  30. Short Circuit • Short circuit – a flaw in a circuit that allows a large current to flow through where it isn’t wanted • A short circuit prevents the rest of a circuit from working

  31. Short Circuit • A safety device is a fuse • A fuse has something that melts if it gets too hot and breaks the circuit • This keeps damage from happening

  32. Fuse • Has anyone ever plugged something in and it doesn’t work? Why might that be?

  33. Comprehension Closure: Parallel Circuits What is the difference between a series circuit and a parallel circuit?

  34. Exploration: Parallel Circuit

  35. Group Exploration: Making a Parallel Circuit • Your group will go to two different stations • You have a creation station as well as a writing station • You will have 10 minutes at each station • You will only rotate when the teacher tells you to

  36. Exploration Closure: Parallel Circuits Draw a picture of a parallel circuit. Label the different pieces in your picture.

More Related