To draw it, connect the cell, switch, and bulb in a single loop with wires, so the switch can break that loop. An open switch stops the bulb because it breaks the path for the current, like a broken road. But I learned it's not just about the break—a loose connection can also look like an open switch and cause the same darkness, which my teacher showed me last week when a simple ceiling lamp refused to light up until we tightened the wire.
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