Percent uncertainty for thermometer: 3043 Percent uncertainty for balance scale:

Question

Percent uncertainty for thermometer: 3043 Percent uncertainty for balance scale:? I 2. For a constant current, I, how is the joule related to this resistance of the heating coil? 3. Which method (calorimetry or electric) do you believe is inherently more precise? Why is this so? Can you justify this using the uncertainty calculations from question 1? What do your graphs of temperature versus time from step 6 tell you about the assumption that the energy put into the system is retained as thermal energy 4. 5. If the cost of electricity were $0.12 kWh, what is the cost of electricity in cents per jK for this experiment ements - L F11 F9 F10 F8 F7 F6 F5

Explanation / Answer

2. By Joule's law of heating, the amount of heat produced is proportional to the electrical resistance of the wire when current in the wire and time of current flowing are constant. So,

H is directly proportional to the R when i and t are constant.

H- Heat

R- Resistance

i- current

t- time

3. calorimetry method is more precise than electric method because electric method is more uncertain and affected by phase errors and electromagnetic interference, whereas calorimetric method allows system losses which manifest as heat and it can be measured directly with high accuracy.

4. Graph from step 6 is required.

5. Details regarding the experiment is required.

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