Basic Electrical Installation Work

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c. 10. circuit also cause an opposition current flow, which call reactance.2 Voltage and current relationships resistive, capacitive and inductive circuits. From Ohm’s law: R V I R R ( ) Ω Definition In any circuit, resistance defined as opposition current flow. circuit, resistance only part the opposition cur- rent flow. current inductive circuit. causes the current the cir- cuit lag behind the applied voltage.c. . causes the current the circuit lag behind the applied voltage, as shown Fig.142 constant f the frequency the supply L the inductance the circuit by X V I L L L R Pure resistance (R) V and phase lags 90° leads 90° Pure inductance (L) Pure capacitance (C) V V I V V I I I I L V I C V I ␻ ␻ V V I I FIGURE 10. The inductance and capacitance a. given the formula: X fL L Ω where π 3. current inductive circuit.c. However, a.2. Definition Inductive reactance (XL) the opposi- tion a.c.Alternating current theory and electrical machines 195 Resistance In any circuit, resistance defined opposition current flow. Inductive reactance (XL) the opposition a