4.5

________________________________________
From: Matt Baker
Sent: Monday, June 20, 2011 8:13 AM
To: Antti Markkanen; Aufar Alif Waldi; Charlotte Cowley; Eliza Mae De Vries; Harriet Beattie; Huei-Yu Daniel Lo; James Arias; Jesper Kwant; Kirk Leekasem; Nicholas Chu; Nuntikorn Kuvanant; Pankhuri Singh; Rajdamrong Diskul; Robins McIntosh; Samir Apaya; Sanhacha Chitvaranund; Savannah Eve Gough; Siraket Wongchindawest; Tatiksha Singh; Yanida Areekul
Cc: maddogscience@posterous.com
Subject: 4.5

4.5 describe a variety of everyday and scientific devices and situations, explaining the fate of the input energy in terms of the above relationship (see 4.4), including their representation by Sankey diagrams

1) 2) wasted heat= 400J Efficiency= useful energy out/total energy in Heat to water= 1000J 1000/2000= 0.5
Sound energy= 600J
3) 4)
efficiency= useful energy out/total energy in 150-30=120J 120/150= 0.8

Sankey Diagrams.ppt Download this file

See the full gallery on Posterous

Objectives 4.2 - 4.4

Efficiency.ppt Download this file

Energy input; energy output worksheets.pdf Download this file

9 Types of energy - answers.ppt Download this file

SCIENTIFIC FACTS TO REMEMBER NEXT TIME.

-Unbalanced forces means that the object is accelerating not "going forwards"

-remember a=(v-u)/t

-acceleration's units are m/s2

-To independently turn off lamps in a series circuit, make it parallel and add its own switch.

-The cell of a circuit affects its current.

- The law of reflection is: (angle) i = (angle) r

- Diffraction for small gap= lines curve into a semicircle.

  Diffraction for big gap= lines only curve on the ends.