1 / 8

(c)Which is the energy-saving light bulb and which is the filament bulb?

Do this now!. A. (a)What are these diagrams called?. (b)How efficient is each light bulb?. B. (c)Which is the energy-saving light bulb and which is the filament bulb?. Title: Efficiency. Friction between the moving parts causes heating. Use wider wires!. Lubrication!.

geri
Télécharger la présentation

(c)Which is the energy-saving light bulb and which is the filament bulb?

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. Do this now! A (a)What are these diagrams called? (b)How efficient is each light bulb? B (c)Which is the energy-saving light bulb and which is the filament bulb?

  2. Title: Efficiency Friction between the moving parts causes heating Use wider wires! Lubrication! The resistance of the wire causes it to get hot when current passes through Key Question: How can we improve the efficiency of Wall E? Air resistance causes energy to be lost to the surroundings Sound created when Wall E moves Streamlined Shape! Tighten bolts!

  3. Wall E is happier now he is more efficient!

  4. Like all machines, even when made more efficient, Wall E still loses heat to the surroundings. • Why is it classed as waste energy? Why is it so difficult to use? It heats up the surroundings, and spreads further and further away from the source.

  5. Industry tries to capture and use heat.

  6. Exam Style Question (about two topics) • The efficiency of a heating system in a house depends upon how much heat is lost. Explain why water pipes are often wrapped with the following material. (4) Foam (bubbles represent trapped air) Pipe Silver Foil

  7. Mark Scheme • Silver foil causes any heat lost by radiation (1) to be reflected (1) back into the pipe. • Heat loss by conduction (1) is stopped through the foam because conduction cannot happen through the trapped air (1).

  8. End of Chapter Questions • Only do 1,2,3 and 5. • Do not do 4 and 6. • We will finish off on Friday.

More Related