2. Anthony designed an electric circuit to test how well different types of metal conduct electricity. The circuit included a battery, a light bulb, wires, and clips that could be attached to a sheet of metal. If the metal conducts electricity poorly, the light bulb would appear dim. If the metal conducts electricity well, the light bulb would appear bright. Anthony collected nine equally sized sheets of metal: three sheets of copper, three sheets of iron, and three sheets of aluminum. He used the clips to attach each metal sheet, one sheet at a time, to the circuit. For each sheet, Anthony used a light meter to measure how much light the bulb produced. What are the independent and dependent variables in this experiment?


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