Name___________________   

 

 

 

 

 

 

Date________ 

Energy Efficiency Worksheet 

        Heating Device_____________________  Volume of water __________________ mL  Energy Input  Initial Time __________ (min)   

Final Time__________(min)      Change in Time_________(min) 

Power _________ (Watts)  Convert the change in time in minutes to hours  t (min)/60 (min/hour)  Change in Time ________________ (hours) This will be a decimal  To determine energy input in calories multiply time in hours by the wattage during heating.  Then multiply  by 860  calories/watt*hour to convert to calories  Energy Input ________________ cal    Useful Energy Output  Before Heating  Initial Temperature _________ F 

(T ‐32)/1.8 =   ______________ C 

After Heating  Final Temperature __________F 

(T ‐32)/1.8 =  

Change in Temperature  

______________C  _____________C 

To calculate the useful energy output, multiply the change in Temperature C by the volume of water to get the energy  change in calories.  Useful Energy Output ____________cal    Adapted from Lets Have Tea Activity 3.11 Global Science   

  Energy Efficiency (%)  Divide the useful energy output (cal) by the energy input (cal) and multiply by 100%.    Energy Efficiency of ________________ is _____________%     Use your hot water to make hot chocolate!   

     

Adapted from Lets Have Tea Activity 3.11 Global Science   

Energy efficiency Worksheet.pdf

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