_________ is the direction of current flow through the two coils

• A. Polarity
• B. Phase
• C. Flux
• D. Resistance

Answer: (A)

Polarity marks how the two windings are oriented relative to each other, using a dot or end labeling to show which ends are positive at any moment. This orientation directly sets the direction of current flow through each coil when a source and load are connected. If currents enter the dotted ends of both windings, the voltages at the other ends have the same instantaneous polarity, which defines how current flows through the two coils in concert. Phase talks about timing between voltages, flux is the magnetic field created by the current, and resistance is just opposition to current. So polarity best describes the actual direction relationship of the currents in the two coils.