This week in Science we learned about closed circuits (they allow electricty to flow through a path) and open circuits (they do not allow electricity to flow).  We assembled circuits and then tested materials to determine if they are conductors or insulators.  Conductors are objects or materials that allow the flow of electricity. The bulb still lights up whey they are included in the circuit.  Insulators block the flow.  When students placed these materials in the path of the circuit, the bulb did not light up.