Need to find the btu/h of electric heater.A single phase electric heater has an output equal to 40,480 btuh an impressed voltage at 240 what will the heating imput be with impressed voltage at 230?
Here is my work 40480/3.412=11864
Ohms= volts squared / watts (240*240)/11864=4.8OHMS
Watts= volts squared * ohms ........... (230*230)/4.8ohms== 10,802.532 watts
Btu's at 230v = 10,802.532*3.413 = 36,869 btu's rounded off
But this is not correct! Why?
Its one of these answers and I would like to know what im doing wrong
36850---, 37160---,37480---,or 38790 btuh
Here is my work 40480/3.412=11864
Ohms= volts squared / watts (240*240)/11864=4.8OHMS
Watts= volts squared * ohms ........... (230*230)/4.8ohms== 10,802.532 watts
Btu's at 230v = 10,802.532*3.413 = 36,869 btu's rounded off
But this is not correct! Why?
Its one of these answers and I would like to know what im doing wrong
36850---, 37160---,37480---,or 38790 btuh