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闭合电路欧姆定律的主要仪器是可调内阻电池,实验电路如图1,外电路A板正极物质是棕褐色的氧化铅(PbO_2),B板负极物质是灰色的铅(Pb)。a,
The main instrument of the closed circuit Ohm’s law is the adjustable internal resistance battery. The experimental circuit is shown in Figure 1. The positive electrode material of the external circuit A plate is tan oxide lead oxide (PbO 2 ), and the negative electrode material of the B plate is gray lead (Pb). a,