In toroidal plasmas immersed in a toroidal field of Bϕ, the electrons drift downward, while the ions drift upward due to the field gradient and curvature. The electrons that have reached the bottom wall return through the conducting vessel to the top, on which they recombine with the ions, completing the current circulation. Helical field lines by the superposition of a vertical field BZ provide another return path of internal current circulation, along which the electrons flow toroidally, generating a toroidal current. These conjectures have been examined on electron cyclotron resonance (ECR) plasmas in the Low Aspect ratio Torus Experiment (LATE) device with current-collecting electrodes at the top and bottom of the vacuum chamber. Upon the blocking of the external return path, the discharges terminate when BZ = 0, while they survive with a toroidal current when BZ is applied, showing that current circulation is vital to maintain the discharge. Detailed studies reveal the characteristics of current circulation and equilibrium. When BZ = 0, the electron pressure profile is a uniform vertical ridge along the ECR layer in accordance with the electron vertical drift current circulating via the external circuit, while an upwardly shifted potential hill arises, providing the ions E × B drift paths around the potential peak to the vicinity of the top electrode. When BZ is applied, the central electron pressure rises with an upwardly shifted peak, being relaxed from the vertical uniformity by addition of the internal return circuit. The space potential VS decreases and the electron density obeys the Boltzmann law under VS. The vertical and toroidal currents are found to be equilibrium currents driven by the base and excess portions of electron pressure, respectively, to ensure the radial force balance of the plasma torus.