Misure elettriciManuale di laboratorio . Coefficiente di temperatura Di Una Bobina Di Filo platinoide. StandardCoil {S). Filo 1Bridge. JT - S. Bobina testata (X). Resiste- %s LETTURE. Ct Resist- 2S a; C- II ance p.^ PXIO* ance ^t B (ohm). A 2 18.1 Oi 2 a^-a. 8^ Q. (ohm). 16,7 15,2 9,8666 ?557,0 442,5 114,5 9,538 0,1090 9,9756 15,2 9,8666 18,3 563,4 435,6 127,8 9,538 0,1218 9,9884 23,1 0,00200 15,2 9,8666 18,4 570,1 429,0 141,1 9,539 0,1345 10,0011 29,1 0,00216 15,2 9,8666 18,4 526,3 43,3 153,0 9,539 0,1459 10,0125 34,9 0,1518,818,66 0,1518,8 0,1518,8 0,59,59,59,586 0,59,59,586 0,586 0,586 0,586 0,586 0,586 10.0223 40.3 O.OISI 15

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Electrical measurementsA laboratory manual . Temperature Coefficient of a Coil of Platinoid Wire. StandardCoil {S). 1Bridge Wire. JT—S. Tested Coil (X). is Resist- %s READINGS. cT Resist- 2S a; C- ii ance p.^ PXIO* ance ^t B (ohms). a 2 18.1 Oi 2 a^-a. 8^ Q. (ohms). 16.7 15.2 9.8666 ?557.0 442.5 114.5 9.538 0.1090 9.9756 15.2 9.8666 18.3 563.4 435.6 127.8 9.538 0.1218 9.9884 23.1 0.00200 15.2 9.8666 18.4 570.1 429.0 141.1 9, 539 0.1345 10.0011 29.1 0.00216 15.2 9.8666 18.4 576.3 423.3 153.0 9.539 0.1459 10.0125 34.9 0.00196 15, 2 9.8666 18.5 581.2 418.0 163.2 9.540 0.1557 10.0223 40.3 O.OOISI 15.4 9.8672 18.6 586.5 412.6 173.9 9.540 0.1659 10.0331 45.2 0.00220 15.4 9.8672 18.7 589.5 409.4 180.1 9.540 0.1718 10.0390 48.1 0 00203 15.7 9.8681 18.8 595.0 403.5 191.5 9.540 0.1827 10.0508 54.0 0.00200 82 ELECTRICAL MEASUREMENTS, Total increase in X= 10.0508 — 9.9756 = 0.0752 ohm.0.0752 Increase per degree 54 — 16.7 0.002016. Resistance of X at 0° C. == 9.9756ohms. ^_ 0.0020169.9409 16.7 X 0.002016 = 9.9409 Therefore, 0.000203.. Fig. 33. 47. The ConductivityBridge. — The C a r e yFoster method furnishesan elegant means ofmeasuring very small re-sistances, such as theresistance of metal bars, rods, and the like. Forthis piupose a specialpiece of apparatus is re-quired. Its principle isprecisely the same as thatemployed in finding pfrom a known differenceof resistance. The rodor bar to be measuredtakes the place of thebridge wire, and its con-ductivity is found by lay-ing off a length of therod equal in resistance toa known resistance repre-sented by accurately ad-justed coils in parallel.The bar to be measured isheld securely by clampsD (Fig. 33). It is parallel RESISTANCE. 83 to a scale U, which is read by a vernier to l-20th mm.The sliding contact may be clamped by the screw M tothe rod which carries it, and a slow motion may then begiven to it by the nut J working against the spring Y.The commutator K commutes both the known resist-ances and the battery, either sim

Parole chiave associate all'immagine

• bookcentury1800
• bookdecade1890
• bookpublisherbosto
• bookyear1895