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2009年高考天津卷中有一道题。[题]图1为一简单欧姆表原理示意图,其中电流表的满偏电流I_g=300μA,内阻R_g=100Ω,可变电阻R的最大阻值为10kΩ,电池电动势E=1.5V,内阻r=0.5Ω,图中与接线柱A相连的表笔颜色应是
Tianjin college entrance examination in 2009 there is a problem. Figure 1 is a schematic diagram of a simple ohm meter, ammeter full amperage I_g = 300μA, internal resistance R_g = 100Ω, variable resistor R maximum resistance of 10kΩ, battery electromotive force E = 1.5V, internal resistance r = 0.5Ω, the color of the pen connected with terminal A in the picture should be