Question

questions 1)

In the science class the teacher prepared the electric circuit using battery, bulb, wires, keys and noticed that the bulb did not light up. What are the possible causes for the bulb not to light?

1) The wiring joints are loose

2) The bulb may be fuse

3) Cell is not working

4) All of above
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Answer 1

Answer:

what is this I can't understand