Homework answers / question archive / EGB113 Energy in Engineering Systems ME1 CONVERSION OF MECHANICAL ENERGY TO ELECTRICAL ENERGY Marking Criteria: Criteria Standards Marks Prelab Questions Answers to questions demonstrate understanding of principles described in laboratory manual instructions Calculations are clearly set out using given data and correct relationships from laboratory manual instructions /4 Recorded data Data entered clearly in tables (or appropriate spaces) to a reasonable number of significant figures Recorded data includes appropriate units row/column headings and units /2 Graphs Informative graph titles Axes clearly labelled with title and correct axis units Axis values indicated (with multipliers if appropriate) Appropriate trend lines identified and neatly drawn (or otherwise determined with evidence) /4 Data Analysis Well set out calculations showing data obtained from measurements or graphs substituted clearly into formulae, identifying any specific techniques of data analysis that were used /4 Conceptual Understanding Your answers to any questions asked in the experimental instructions are plausible within the context of the experiment Answers to questions demonstrate understanding of connection between obtained data and the physical concepts described in the laboratory manual instructions /6    TOTAL      /20 =      /10   Teaching team member signature: ________                                                    Date__/__/___ ME1 CONVERSION OF MECHANICAL ENERGY TO ELECTRICAL ENERGY PRE-LAB QUESTIONS Read the laboratory manual instructions for this experiment and answer these questions before the lab class PART A 1

EGB113 Energy in Engineering Systems ME1 CONVERSION OF MECHANICAL ENERGY TO ELECTRICAL ENERGY Marking Criteria: Criteria Standards Marks Prelab Questions Answers to questions demonstrate understanding of principles described in laboratory manual instructions Calculations are clearly set out using given data and correct relationships from laboratory manual instructions /4 Recorded data Data entered clearly in tables (or appropriate spaces) to a reasonable number of significant figures Recorded data includes appropriate units row/column headings and units /2 Graphs Informative graph titles Axes clearly labelled with title and correct axis units Axis values indicated (with multipliers if appropriate) Appropriate trend lines identified and neatly drawn (or otherwise determined with evidence) /4 Data Analysis Well set out calculations showing data obtained from measurements or graphs substituted clearly into formulae, identifying any specific techniques of data analysis that were used /4 Conceptual Understanding Your answers to any questions asked in the experimental instructions are plausible within the context of the experiment Answers to questions demonstrate understanding of connection between obtained data and the physical concepts described in the laboratory manual instructions /6    TOTAL      /20 =      /10   Teaching team member signature: ________                                                    Date__/__/___ ME1 CONVERSION OF MECHANICAL ENERGY TO ELECTRICAL ENERGY PRE-LAB QUESTIONS Read the laboratory manual instructions for this experiment and answer these questions before the lab class PART A 1

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EGB113 Energy in Engineering Systems

ME1 CONVERSION OF MECHANICAL ENERGY TO ELECTRICAL ENERGY

Marking Criteria:

Criteria	Standards	Marks
Prelab Questions	Answers to questions demonstrate understanding of principles described in laboratory manual instructions Calculations are clearly set out using given data and correct relationships from laboratory manual instructions	/4
Recorded data	Data entered clearly in tables (or appropriate spaces) to a reasonable number of significant figures Recorded data includes appropriate units row/column headings and units	/2
Graphs	Informative graph titles Axes clearly labelled with title and correct axis units Axis values indicated (with multipliers if appropriate) Appropriate trend lines identified and neatly drawn (or otherwise determined with evidence)	/4
Data Analysis	Well set out calculations showing data obtained from measurements or graphs substituted clearly into formulae, identifying any specific techniques of data analysis that were used	/4
Conceptual Understanding	Your answers to any questions asked in the experimental instructions are plausible within the context of the experiment Answers to questions demonstrate understanding of connection between obtained data and the physical concepts described in the laboratory manual instructions	/6
	TOTAL	/20 =      /10

 

Teaching team member signature: ________                                                    Date__/__/___

ME1 CONVERSION OF MECHANICAL ENERGY TO ELECTRICAL ENERGY

PRE-LAB QUESTIONS

Read the laboratory manual instructions for this experiment and answer these questions before the lab class

PART A

1. Write an expression describing the energy conversion that occurs in Part A of the experiment._________________________________________________________________________________________________________________________________________________________

2. The experiment in Part A is run using a 0.115 kg mass attached to a thread wound around the pulley. It falls from rest through a vertical height of 1.209 m in 0.66 s. Assuming that the acceleration of the mass is constant, calculate the velocity of the mass at the end of its fall. (Hint: the acceleration probably won't be 9.8 ms^-2). ___________________________________________________________________________________________________________________________________________________________________

PART B

3. In 1-2 sentences, explain the basics of hydroelectric power generation.________________________________________________________________________________________________________________________________________________________

4. A dam 143 m above a hydroelectric generator holds 1.6 x 10¹⁵ L of water. If the generator is taken to be at a height of 0 m, how much potential energy is stored in the dam?______________________________________________________________________________________________________________________________________________________________

EXPERIMENTAL OBSERVATIONS

PART A

Sketch the graph of power vs time from the computer here. Remember to insert informative graph title, labels on axes, an indicative scale and units.

 

Height 1 (h₁) = ___ ( )

m (    )	mgh (     )	T (    )	KE (     )	Energy generated (   )	Unaccounted for energy (     )	% efficiency

 

Show sample calculations for potential, kinetic and unaccounted energy here

Height 2 (h₂) = _____ ( )

m (    )	mgh (     )	T (    )	KE (     )	Energy generated (    )	Unaccounted for energy (     )	% efficiency

 

Height 3 (h₃) = ____ ( )

m (    )	mgh (     )	T (    )	KE (     )	Energy generated (   )	Unaccounted for energy (     )	% efficiency

 

Answer this question after completing Part A

On the last page of the proforma, plot efficiency vs mass for the three different heights that were investigated. What, if anything, can you conclude from the graph?

____________________________________________________________________________________________________________________________________________________________________

PART B

Diameter of water cylinder                                 =   2r   = ________ (  )

Height of Nozzle                                                      h_nozzle = ________ ( )

Initial height of water column                                  h_Top = ________ (  )

Final height of water column                               h_Bottom = ________ ( )

Energy Generated (area under P vs t graph)                = ________ (  )

Sketch the graph of power vs time from the computer here. Remember to insert informative graph title, labels on axes, an indicative scale and units.

 

Using Equation 5, calculate the mass of water used below:

Using Equations 4 and 2, calculate the change in potential energy:

Calculate the efficiency of the conversion of potential energy to electrical energy:

Answer this question after completing Part B

Why isn’t the conversion process 100% efficient? Where does the rest of the energy go?

____________________________________________________________________________________________________________________________________________________________________

Part A Graph

Plot efficiency vs mass for the three different heights that were investigated. Remember the graph title, labels on axes, and units.