Conventional Electrical theory (simplified) states that electricity flows from positive to negative in contrast to Electron Theory which supposes negative to positive flow of electrons.
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.
Non Conventional Source of Energy
Coal, oil, natural gas, hydro
Coal, Wood, Electricity or Gas
Probably the question refers to the sources which provide most of our electricity, like coal and oil, hydro, and nuclear.
Conventional theory.
To answer this question we're need information about Mary to know what level she is in.
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.
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