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填空题
图中两只灯泡的连接方式是____联，它们工作时的电阻要____（填“相同”或“不同”）．
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参考解析
解析：
由图示电路图知，两灯泡是并联的：探究电功与电流的关系应控制电压相同而电流不同，两并联灯泡的电阻应该不同．
由图示电路图知，两灯泡是并联的：探究电功与电流的关系应控制电压相同而电流不同，两并联灯泡的电阻应该不同．
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