Question 249: AC fundamentals

Question

$\mathrm{L}, \mathrm{C}$ and R are connected in series to an a. c. source. Which one of the following is true?
Phase relation between current and voltage is such that

Accepted Answer

In a
resistor (R):
Current ($I$) and voltage ($V$) are
in phase
. (No phase difference.)
In an
inductor (L):
Voltage
leads
current by $90^\circ$, or equivalently, current
lags
voltage by $90^\circ$. Ã¢ÂÂ Out of phase.
In a
capacitor (C):
Current
leads
voltage by $90^\circ$, or equivalently, voltage lags current by $90^\circ$. Ã¢ÂÂ Out of phase.
So:
For
R
Ã¢ÂÂ in phase
For
L
Ã¢ÂÂ out of phase
For
C
Ã¢ÂÂ out of phase
Now check options:
A:
Ã¢ÂÂBoth are out of phase with each other in R.Ã¢ÂÂ Ã¢ÂÂ Wrong, in R they are in phase.
B:
Ã¢ÂÂBoth are in phase in L and out of phase in C.Ã¢ÂÂ Ã¢ÂÂ Wrong, in L they are out of phase.
C:
Ã¢ÂÂBoth are out of phase in L and in phase in C.Ã¢ÂÂ Ã¢ÂÂ Wrong, in C they are out of phase.
D:
Ã¢ÂÂBoth are out of phase in both C and L.Ã¢ÂÂ Ã¢ÂÂ Correct Ã¢ÂÂ
Final Answer:
$ \boxed{D} $ Both are out of phase in both capacitor and inductor.

Answer

both are out of phase with each other in ' R '.

Answer

both are in phase in ' L ' and out of phase in ' $C$ '.

Answer

both are out of phase in ' L ' and in phase in 'C'.

Answer

both are out of phase in both ' C ' and ' L '.

AC fundamentals

\mathrm{L}, \mathrm{C} and R are connected in series to an a. c. source. Which one of the following is true? Phase relation between current and voltage is such that

Choose the correct answer: