. Laboratory exercises in elementary physics. 18. sist of, 1, 5 and 10 yards No. 28 copper wire ; 2, 20 yardsNo. 28 copper wire; 3, 5 yards No. 24 (larger cross-section)copper wire; 4, 5 yards German-silver wire, No. 24 or , as labelled, same cross-section as one of the coils ofcopper wire of 5-meter length. Insert in turn 5, 10, 20. Fig. 19. yards No. 28 copper wire, 5 yards No. 24 copper wire,5 yards German-silver wire. Record results in : TABLE II. Material. Length. Cross-section.(By number.) Galv. Read. ELECTRICAL RESISTANCE. 33 Questions.—Write in your note-books what has be
. Laboratory exercises in elementary physics. 18. sist of, 1, 5 and 10 yards No. 28 copper wire ; 2, 20 yardsNo. 28 copper wire; 3, 5 yards No. 24 (larger cross-section)copper wire; 4, 5 yards German-silver wire, No. 24 or , as labelled, same cross-section as one of the coils ofcopper wire of 5-meter length. Insert in turn 5, 10, 20. Fig. 19. yards No. 28 copper wire, 5 yards No. 24 copper wire,5 yards German-silver wire. Record results in : TABLE II. Material. Length. Cross-section.(By number.) Galv. Read. ELECTRICAL RESISTANCE. 33 Questions.—Write in your note-books what has beenlearned as regards: 1. The equal resistance of The sort of bodies that seem to have the highest resistance,and the sort that seem to have the lowest. 3. The resist-ance of water and the effect of adding acid. 4. The condi-tions affecting the resistance of a body. 5. The reason whythe wires are of copper. 6. The reason why they are coveredwith cotton, etc. 7. The reason why the covering must beremoved where connections are made. 8. Give a definitionof resistance. 9. What part of the circuit has been usedin this experiment ? 10. Has anything been observed atthe ends of the wires on making and breaking circuit ? Ifso, what ? 11. What goes on, so far as you have observed,when the current is passed through water ? Or throughwater
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