Circle diagram constant air-gap induction motor images shown here, where, The circle diagram is drawn using the data obtained from no load and either short circuit or, in case of machines, blocked rotor tests by fitting a half-circle in points O and A. Beyond the error inherent in the constant air-gap assumption, the circle diagram introduces errors due to rotor reactance and rotor resistance variations caused by magnetic saturation and rotor frequency over the range from no-load to operating speed. Steinmetz equivalent circuit Circle diagram First conceived by A. Heyland in 1894 and B.A. Behrend in 1895, the circle diagram is the
Venn diagram statements as statements about sets. Additionally, they propose to treat singular statements as statements about set membership. So, for example, to represent the statement “a is F” in this retooled Venn diagram, a small letter “a” may be placed inside the circle that represents the set F. Venn diagrams correspond to truth tables for the propositions formula_5, formula_6, etc., in the sense that each region of Venn diagram corresponds to one row of the truth table. This type is also known as Johnston diagram. Another way of representing sets is with John F. Randolph's R-diagrams. Venn diagram A Venn diagram