Question 181: AC fundamentals

Question

The power factor of $$AC$$ circuit having resistance $$(R)$$ and inductance $$(L)$$ connected in series and an angular velocity $$\omega $$ is

Accepted Answer

The impedance triangle for resistance $$\left( R \right)$$ and inductor $$(L)$$ connected in series is shown in the figure.
Power factor $$\cos \phi  = {R \over {\sqrt {{R^2} + {\omega ^2}{L^2}} }}$$

Answer

$$R/\omega L$$

Answer

$$R/{\left( {{R^2} + {\omega ^2}{L^2}} \right)^{1/2}}$$

Answer

$$\omega L/R$$

Answer

$$R/{\left( {{R^2} - {\omega ^2}{L^2}} \right)^{1/2}}$$

AC fundamentals

The power factor of $AC circuit having resistance (R) and inductance (L) connected in series and an angular velocity \omega $ is

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