S: Potato batteries
BC: Text and photos taken from: http://www.instructables.com/id/Potato-Battery-Driven-LED/?ALLSTEPS
FC: Yes, that's a battery!
1: Practice the imperative with potato batteries! TECHNICAL ENGLISH CAN BE FUN!
3: (GATHER / RECYCLE) ________________ THE FOLLOWING TOOLS AND SUPPLIES: Potatoes Galvanized nails Shinny copper pennies Wires with alligator clips on each end (2+ per battery) LED bulb Multi meter Knife Cutting board | Everyday objects: ______________ ______________ ______________ | Specialized supplies: __________________________________________________________________________________________________ | Choose the correct verb:
5: A battery is a way to store electrical energy. For a battery to work it needs to have 3 things, two electrodes (metals, one + and one -) and electrolytes (minerals). The batteries we are going to make today uses the electrodes of copper (pennies, anodes, +) and zinc (galvanized nails, cathode, -) and the electrolyte of K (Potassium) that is found in potatoes. | Metals: ________________________________________________________
7: (Cut/Take) ______________ a potato (Cut/Place) ______________it in half. This will make 2 batteries. Potatoes are juicy, which is part of the reason they can be made into batteries. | Choose the correct verb:
9: (Take/Clean) ______________________ a knife and (put/draw) _______________ a slit in the potato and slip the penny into the slit. Push as much of the penny into the slit as possible, you want just a little bit sticking out of the potato. (Push/Pull) ____________ the nail most of the way into the potato,(at this point I cut the nails in half, so that they weren't so tall). Do not let the electrodes touch, keeping them about 1 inch apart. Step 6 (Turn off/Turn on) _____________ the Multimeter and put it at the lowest voltage reading. (Put/Make sure) ________________ the red probe is in the + slot and the black probe is in the – slot. | After you choose the right verbs in each case, underline MORE verbs in the imperative! | Find: 1. One negative imperative: ______________ 2. Three verbs that are not in the imperative: __________________________________________ | Choose the correct verb:
11: _______________ the red line to touch the penny in the potato and the black line to touch the nail. You can read how much voltage you have available in this potato battery. It reads .85 volts, not bad but not enough to do anything fun. To increase the voltage, ______________ more potato batteries and ______________ them in a series (that means to connect the + electrode of one battery to the – electrode of the next battery). So I created 3 more batteries from 3 more potato halves. | Use these verbs to complete the text on the left: create wire use
13: (Use/Connect) __________________the alligator clips connected to wires in order to wire the first 2 potatoes together, This time the voltage reads 1.69 volts!! | Choose the correct verb:
15: _______________ a minute and _______________ at the LED light. It has one long leg and one shorter leg. The longer leg is the anode (+) and the shorter leg is the cathode (-). I clipped the batteries to the LED light (+ to+ and - to-), no light, therefore, not enough voltage. I wired all four batteries together in series, and found what the total voltage is of the 4 batteries was 2.38 volts and I again wired in the LED light, again no light. | Use two of these verbs to complete the first paragraph on the left: have push take look | Find verbs in the past: ________________________________________________________________________________________________________________________________
17: Finally I wired six batteries in series and it had a 4.08 volt reading. This time the light lit up! Hurray! Potatoes can be used as batteries. | Are there verbs in the imperative on the left? YES / NO
19: Have fun playing with your new batteries, maybe you would like to experiment with increasing current by wiring the potato batteries in parallel as well as series. Good luck and Enjoy! | Find 2 verbs in the imperative on the left