Expt. No.
Observation
Figure
AIM
To draw a sankey diagram
Requirements Input and output energy of different applainces.
Procedure
1
Study the example of energy transformation
2
Calculate the efficiency
3
Draw the sankey diagram
Apparatus Input
(a) Light bulb
1000 J
(b) Motor
2500 J
(c) Speaker
1200 J
Output
Efficiency
E%
600
600
Light = 600J
 0.6
 100  60%
1000
1000
Heat = 400J
Kinetic=1500J
Heat = 500 J
Sound = 500 J
Sound = 800 J
Heat = 400 J
Formula for efficiency
(a) Decimal :
Useful Output Energy
Input energy
(b) Percentage :
Useful Output Energy
 100
Input energy