Terman (1943), pp. 37, Table 18; 78 provides an expression for the ratio of resistance to alternating current to resistance to direct current for an isolated litz wire; Terman cites Butterworth (1926). It does not apply to windings with multiple turns. An expression for the resistance ratio in windings is given by Sullivan (1999), pp. 284, Eqn 2; 289, Appendix A. Terman, Frederick E. (1943), Radio Engineers' Handbook, McGraw-Hill, pp. 37, 74, 80 Butterworth, S. (August 1926), "Effective Resistance of Inductance Coils at Radio Frequency", Wireless and Wireless Eng., 3: 483 Sullivan, Charles R. (March 1999), "Optimal Choice for Number of Strands in a Litz-Wire Transformer Winding"(PDF), IEEE Transactions on Power Electronics, 14 (2): 283–291, Bibcode:1999ITPE...14..283S, doi:10.1109/63.750181
Wojda (2016). Wojda, Rafal P. (September 2016), "Winding resistance and power loss for inductors with litz and solid-round wires", Power Electronics and Motion Control Conference (PEMC), 2016 IEEE International, IEEE, doi:10.1109/EPEPEMC.2016.7752107
Terman (1943), pp. 37, Table 18; 78 provides an expression for the ratio of resistance to alternating current to resistance to direct current for an isolated litz wire; Terman cites Butterworth (1926). It does not apply to windings with multiple turns. An expression for the resistance ratio in windings is given by Sullivan (1999), pp. 284, Eqn 2; 289, Appendix A. Terman, Frederick E. (1943), Radio Engineers' Handbook, McGraw-Hill, pp. 37, 74, 80 Butterworth, S. (August 1926), "Effective Resistance of Inductance Coils at Radio Frequency", Wireless and Wireless Eng., 3: 483 Sullivan, Charles R. (March 1999), "Optimal Choice for Number of Strands in a Litz-Wire Transformer Winding"(PDF), IEEE Transactions on Power Electronics, 14 (2): 283–291, Bibcode:1999ITPE...14..283S, doi:10.1109/63.750181
Terman (1943), pp. 37, Table 18; 78 provides an expression for the ratio of resistance to alternating current to resistance to direct current for an isolated litz wire; Terman cites Butterworth (1926). It does not apply to windings with multiple turns. An expression for the resistance ratio in windings is given by Sullivan (1999), pp. 284, Eqn 2; 289, Appendix A. Terman, Frederick E. (1943), Radio Engineers' Handbook, McGraw-Hill, pp. 37, 74, 80 Butterworth, S. (August 1926), "Effective Resistance of Inductance Coils at Radio Frequency", Wireless and Wireless Eng., 3: 483 Sullivan, Charles R. (March 1999), "Optimal Choice for Number of Strands in a Litz-Wire Transformer Winding"(PDF), IEEE Transactions on Power Electronics, 14 (2): 283–291, Bibcode:1999ITPE...14..283S, doi:10.1109/63.750181
