The conventional trade theory assumes perfect markets where transaction costs do not exist while the theory of multinational enterprises assume imperfect markets.
electricity
conventional theory is pos to neg. electrical theory is neg to pos.
Coal, oil, natural gas, hydro
Coal, Wood, Electricity or Gas
Electricity always flows from the positive terminal to the negative terminal in a closed circuit. This flow of electricity is known as the conventional current.
Conventional theory.
Probably the question refers to the sources which provide most of our electricity, like coal and oil, hydro, and nuclear.
The theory belief is that electricity flows from a negative source to a positive source.
Conventional theatre is made of standard acts that are following aristotle's theory of plot structure. Aristotle said plot (beginning, middle and end) was the most important part of drama, he said it was more important then the characters. That was his theory.
Galvani's theory to explain his first investigation was that animal electricity was responsible for the contraction of muscles, rather than an external source of electricity. He believed that the electricity originated within the muscle tissue itself, leading to the concept of "animal electricity."
For electricity the main conventional fuels are coal and natural gas, and hydro power would also be considered conventional. Nuclear probably not, though it has been in use over 50 years now. For transport and the chemical industry, oil is the main conventional fuel