TEACHER'S GUIDE LAB PRACTICUM.doc - TEACHER\u2019S GUIDE TO LAB PRACTICUM ELECTRICAL ENERGY CURRENT AND CIRCUITS Name Group Number Date Period SAFETY Never

TEACHER'S GUIDE LAB PRACTICUM.doc - TEACHER’S GUIDE TO...

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TEACHER’S GUIDE TO LAB PRACTICUM: ELECTRICAL ENERGY, CURRENT AND CIRCUITS Name: _____________________________ Group Number: _____ Date: _____________ Period: ______ SAFETY: Never eat or drink anything in the laboratory. Always follow proper laboratory dress code. Always read all instructions before beginning the experiments. Never rewire or take apart any element within the circuit. Never short circuit the batteries. Unhook all circuit components when finish (or at the end of each period) Clean all appropriate materials Allow all equipment to cool before storing. PART A: Creating an Electrochemical Cell OBJECTIVE: To identify the main components of an electrochemical cell and the factors that affects its voltage. MATERIALS: Multi-meter (with probes) (or Voltmeter) Film canister (with top) (many photo labs will give you their empty film canister – the problem now is that most people have a digital camera and do not use film; film canisters can be ordered from Educational Innovations ( ) for $12.95 (~40 count) or $49.95 (~200 count)) An 8mm piece of copper wire (12-14 gauge) (12-14 gauge wire works best since it sturdy but still malleable enough to work with. Copper can be ordered on-line but it usually comes in large and expensive rolls. A building supply store allows for a portion of the wire to be cut from the roll (7½ ft is enough for 28 pieces (~8 cm)). It is suggested that the teacher cut the wire prior to the lab) Two galvanized nails ( this means they are zinc coated; they are easily found at building supply or hardware stores) Distilled or purified water Lemon juice (from concentrate) or table salt (salt is cheaper but lemon juice is easier to use and dissolve and gives a more dramatic result) A lemon (or other citrus fruit) Knife (suggested that the instructor be in charge of the knife or razor blade) A pre-1982 penny (these pennies are almost 100% Copper and work better than the post-1982 pennies; if post-1982 pennies must be used more lemon cells may be needed; copper wire (10-14 gauge is another alternative) A post-1965 nickel, dime, or quarter Two alligator clip wires (pieces of thin copper or insulated wire can be used instead) Parts of a Film Canister Electrochemical Cell Procedure:
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1. Take the film canister lid and one of the nails and poke two holes in the top as shown in Figure 1 (this may already have been done for you). (It is suggested that the teacher pre-punch all the lids for Safety and Time Concerns) 2. Fill the canister with the distilled or purified water about ¾ the way full. 3. Place the lid on the canister and insert one of the nails in one of the holes and the copper wire in the other. 4. DESCRIBE the three main parts of an electrochemical cell. Assign each of these parts to the components of the Film Canister Cell.
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  • Fall '13
  • Porter-Davis
  • electrical energy

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