Lub cav qev tsis tau viav vias

Tshawb xyuas seb lub cav yog qhov ntsuas qhov twg thiab seb daim npav npav puas muaj teeb meem tawm (Tsab ntawv cim: yog tias lub cav ntiag tug ntsuas nws, ntsuas qhov teeb liab yog -5V mus rau + 5V DC teeb liab) Yog tias yog, kos yog tias lub teeb meem galvanometer txuas nrog kom zoo. Tom qab lees tias qhov kev txuas ntawd yeej muaj tseeb, kos nws. Yog tias tseem tsis muaj viav vias, xyuas seb qhov kab xev lem puas tawm los yog tshem tawm. )