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the electric lights in the classroom were not functioning. So Mario, a first year student,tried to find out why they would not light. He observed the bulb, the wiring connections, the outlet, the plug, starter and the ballast. He formulated several hypotheses as to why the bulbs would not light. Later these were tested to find out which of the hypotheses is correct. Then he was able to find out that the bulbs would not light because of faulty wiring connection.

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12y ago
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