What is the difference between two sentences?
1) I spoke with the engineer who developed the engine
2) I talked with the engineer who developed the engine
I wonder if the word 'speak' imply the meaning of having a conversation by telephone.
That is why I asked this question.
No, no difference, however, there are situations in which one or the other is preferred.
There is a slight difference in level of language: speak is considered the more formal, talk is considered less formal, perhaps even diminutive, except in the case of the noun talk.
Interesting thread. I think this maybe one of the occasions that highlights the difference between American and British English. In England, we would not use either sentence. In England you would say " I spoke/talked to the engineer who developed the engine."