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Energy and Power of Electric Circuits and Electrochemical Batteries:

Extracts from this document...


Robert Fox

5 May, 2007

Group 4

Energy and Power of Electric Circuits and Electrochemical Batteries:

Planning A:


Electrical energy is very important for the human race and the everyday life of most people because energy is being used all the time and it is mostly electrical energy and with that most energy is also transformed into electrical energy or some variant of such as nuclear energy etc. therefore it is needed and most important to understand electricity in the everyday world but more specifically the use of batteries which can be shown through simple circuit board set ups. A battery has both a chemical and physical component to them. This is different from battery to battery e.g. electrochemical batteries (there is a transfer of electrons to ions)

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 + Sn+2

Pb+2 + 2e- -> Pb


Mg -> 2e- + Mg+2

Cu+2 + 2e- -> Cu


Zn -> 2e- + Zn+2

Fe+2 + 2e- -> Fe


Mg -> 2e- + Mg+2

Fe+2 + 2e- -> Fe


According to the data the lowest voltages are of the Pb and Sn and the highest ones being Mg and Cu (half cells) for the lowest power expected there needs to be a very low enthalpy and for the highest, a high enthalpy respectively. This means that as the temperature is increasing the particles in the metal start to move faster and making the energy move faster therefore increasing the power. We can also alter the material and thus there will be a change in amount of free electrons.

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A salt bridge2 x 100ml beakers

The Circuit:

  • Ammeter
  • Hot plate
  • Thermometer
  • 1.0 mol Strips of Magnesium, Iron, Copper, Zinc, Lead and Tin
  • Wires
  • Voltmeter


  1. Keep the surroundings constant (pressure and temperature)
  2. Next make a Galvanic Cell by Pouring 50 ml of 1 M ZnSO4 into one beaker and 50 ml of 1 M CuSO4 into another.
  3. Put Zinc and Copper into corresponding beakers
  4. Connect the beakers with a salt bridge
  5. Measure the voltage and the current (voltmeter, ammeter) by attaching  them to the metal strips
  6. Calculate the power
  7. Repeat steps 1 to 5 but change the metals and sulphates according to the data table in hypothesis.
  8. Build a circuit (using wires and a constant power source)
  9. place a strip of  1 mol Magnesium in the middle of the circuit and attach it
  10. Calculate the power
  11. Raise the temperature by 10º C
  12. Calculate the enthalpy
  13. Find the power
  14. Repeat the process from step 10  14  another 4 times
  15. Record data

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