Laboratory exercises to accompany Carhart and Chute's First principles of physics . ng alow external resistance and a high external resistance,with the cells connected in each of the two ways, a gen-eral conclusion may be reached. Experimental: (a) Two small-sized Daniell cells are set up. By theuse of a combination of switches, as shown in Fig. 94, orby the use of simple connecting wires, the zinc of one cell is connected to the copper of theother. The resistance box andthe ammeter are connected inseries with the two remainingterminals. After making theconnections, inspect them to seethat all
Laboratory exercises to accompany Carhart and Chute's First principles of physics . ng alow external resistance and a high external resistance,with the cells connected in each of the two ways, a gen-eral conclusion may be reached. Experimental: (a) Two small-sized Daniell cells are set up. By theuse of a combination of switches, as shown in Fig. 94, orby the use of simple connecting wires, the zinc of one cell is connected to the copper of theother. The resistance box andthe ammeter are connected inseries with the two remainingterminals. After making theconnections, inspect them to seethat all the current must passthrough each part of the circuit;this is the test of a series con-nection. Withdraw the from the resistance box. V- 4—J V J Read the ammeter and record in \ / \ J ^e takle of observations placed near the top of the left-hand the plug, and,without changing connections, remove the 20-ohm the ammeter and record. (J) Connect the two copper plates and connect the twozinc plates. To the combined copper terminal connect. Fig. 94. GROUPING OF CELLS 265 the + terminal of the ammeter, and then connect the re-sistance box between the other terminal of the ammeterand the combined zinc terminal of the cells. Be sure thatthe coppers of the cells have no other connection with thezincs, except through the ammeter and resistance cells are now connected in parallel with each otherand are sending a current through the resistance box, andthe same current through the ammeter. Take readingsthrough the coil and through the 20-ohm coil,and record, as in (a). Observations Connection of Cells Series Series Parallel Parallel Resistance ._. ohms ohms ohms ohms Current amp. ._ amp. amp. amp. Make two connection diagrams, one showing the cellsin series connected with the resistance box and ammeter,and the other showing the cells in parallel connected withthe resistance box and ammeter. A brief descriptionshould accompany the
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectphysics, bookyear1913
