Question 455: AC fundamentals

Question

The potential differences across the resistance, capacitance and inductance are 80 V, 40 V and 100 V respectively in an L-C-R circuit. The power factor of this circuit is

Accepted Answer

Power factor, cos $$\phi $$ = $${R \over Z}$$
= $${{{V_R}} \over V}$$
= $${{{V_R}} \over {\sqrt {V_R^2 + {{\left( {{V_L} - {V_C}} \right)}^2}} }}$$
= $${{80} \over {\sqrt {{{80}^2} + {{\left( {100 - 40} \right)}^2}} }}$$
= 0.8

Answer

0.4

Answer

0.5

Answer

0.8

Answer

1.0

AC fundamentals

The potential differences across the resistance, capacitance and inductance are 80 V, 40 V and 100 V respectively in an L-C-R circuit. The power factor of this circuit is

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