Question

In an RC circuit the value of R is double the value of `X_c`, the phase angle is then a) 30 degrees b) 45 degrees c)60 degrees?

Answer 1

None of the above

Explanation:

In a RC circuit:

`Z = R - j X_c = R(1 - j/2) qquad because R = 2 X_c`

For phase angle `phi`:

`tan phi = - 1/2 implies phi ~~ -26.57°`

Current leads voltage by `26.57°`