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题目:如图所示,L 是标有“6V、3W”字样的灯泡,它与电阻 R、滑动变阻器 R’组成串联电路,电源电压保持8伏不变.求:电阻 R 和滑动变阻器 R’的阻值各是
Title: As shown in the figure, L is a bulb marked with “6V, 3W”. It is connected in series with a resistor R and a sliding rheostat R’. The power supply voltage is kept constant at 8 volts. Find: resistance R and sliding rheostat The resistance of R’ is