Assess students' ability to construct and test a simple closed electric circuit to light a bulb: identify and select components (battery, bulb, wires, optional switch), assemble a working closed circuit, distinguish open vs closed circuits, explain in simple terms why the bulb does or does not light (basic current flow), perform basic troubleshooting (loose connections, dead battery, broken filament), and follow safe handling procedures; includes short hands-on or diagram-based tasks and brief written explanations.