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Experiment 1 – PASCO ET-8782 Energy Transfer– Thermoelectric User Manual

Page 15

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Model No. ET-8782

Energy Transfer –Thermoelectric

15

®

Experiment 1:

Teachers’ Notes–Conservation of Energy

and the First Law of Thermodynamics

This sample data is in the file “Conservation of Energy Data”.

Heat Pump Mode

Q

hot

= 172.8 J

Q

cold

+ W = 233.1 J

1) Most of the heat pumped out of the cold reservoir went into the hot reservoir. The heat

pumped into the hot reservoir is greater than the heat pumped out of the cold reservoir
because Q

hot

also includes the work done by the peltier.

2) Q

hot

< Q

cold

+ W. Some energy was lost. Part of it flowed through the insulator to the

environment. Part of it was dissipated in other parts of the circuit.

3)

Q

hot

= Q

cold

+ W – E

lost

Heat Engine Mode

W

observed

= 0.572 J

Q

hot

Q

cold

= 3.3 J

4)

W

observed

< Q

hot

Q

cold