The behavior of current and voltage in a star connection with resistors at symmetric and asymmetric load, with and without neutral conductor connection, as well as in a delta connection can be coherently and thoroughly studied and taught.
The operating characteristics of the most important transformers, single-phase transformers, single-phase isolating toroidal transformers, single-phase auto- transformers, and three-phase transformers, can be safely studied and learned using experimental transformers in load, no-load, and short circuit conditions.
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