Question

Why do bulbs have two terminals?

Answer 1

in every electric appliances there will be two terminals to pass the electric current.in a bulb,two terminals +ve and -ve are to pass the current through it.
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Answer 2

Answer:

The bulbs have two terminals because, a circuit can be completed only when there are both the positive terminal as well as negative terminal, as the current flow is allowed only when the circuit is complete. Hence, the bulb has two terminals.