The electromagnetic form factors of the trinucleons 3 H and 3 He are calculated with wave functions obtained with the Argonne v 18 two-nucleon and Urbana IX three-nucleon interactions. Full account is taken of the two-body currents required by current conservation with the v 18 interaction as well as those associated with N ∆ transition currents and the currents of ∆ resonance components in the wave functions. Explicit three-nucleon current operators associated with the two-pion exchange three-nucleon interaction arising from irreducible S-wave pion-nucleon scattering is constructed and shown to have very little effect on the calculated magnetic form factors. The calculated magnetic form factor of 3 H, and charge form factors of both 3 H and 3 He are in satisfactory agreement with the experimental data. However, the position of the zero in the magnetic form factor of 3 He is slightly underpredicted.

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