3-20Figure 3-14B.—Virtual ground circuits.Figure 3-14C.—Virtual ground circuits.In view (A), V1 (the left-hand battery) supplies +10 volts to the circuit while V2 (the right-handbattery) supplies -10 volts to the circuit. The total difference in potential in the circuit is 20 volts.The total resistance of the circuit can be calculated:Now that the total resistance is known, the circuit current can be calculated: