Fig. 1,340.—Impedance diagram for the circuit shown in fig. 1,339. Note that the resultant reactance being due to excess of inductance, the impedance line AC' falls above the horizontal line AB. This indicates that the current lags behind the pressure.
When all three quantities, resistance, inductance, and capacity are present, the equation is as follows:
| impressed pressure | = | √(ohmic drop2 + (inductive drop - capacity drop)2) | |
| Eim | = | √(Eo2 + (Ei - Ec)2) | (6) |
Substituting in this last equation (6), the values given in (3), (4) and (5)
| Eim | = | √(R2I2 + (2πfLI - (I / (2πfC)))2) | |
| = | I√(R2 + (2πfL - (1 / (2πfC)))2) | (7) |
Fig. 1,341.—Diagram of circuit containing 25 ohms resistance, .15 henry inductance, and 125 microfarads capacity, with current of 8 amperes at 60 frequency.
Ques. What does the quantity under the square root sign in equation (7) represent?