4. Quality of observations/data 

 Consistent data 
Current should remain constant, and Vtotal
should equal V1 + V2. 
 Accurate measurements/observations 
A/Vmeter readings to the smallest division
of scales. 
 Completed data table 
All available data recorded. 
 Correct units 
Current (I) in mA; voltage in V. 
 Qualitative description 
* 
5. Graph 
Not required for this task 
 Curve is appropriate to data trend 

 Points plotted accurately 

 Appropriate scale 

 Axes labelled with variables 

 Variables placed on correct axes 

6. Calculations 

 Calculated accurately 
* 
 Substituted correctly into relationship 
Calculated values substituted accurately into
formula. 
 Relationship stated or implied 
* (Relationship stated by formula provided.) 
 Units used correctly 
Convert from mA into A in the equations to
produce power in watts. 
 Use of all data available 
Use the averages of the two trials and total
voltage in circuit. 
7. Conclusion 

 Consistent with scientific principles 
* 
 Sources of error 
* 
 Consistent with data 
Conclusion is consistent with student's experimental
results. 
 Relationship among variables stated 
Power is the product of total voltage and
current. 
 Variables stated in conclusion 
Power dissipated across two resistors in watts 