Question

In a box Z of unknown elements, Lor R or any other combination, an ac voltage
in an ac voltage E = Eo sin(ot+o) is app
and current in the circuit was found to be l = lo sin ot+0+π ÷4


The unknown element in the box may be​

Answer 1

Ans ; as the current is leading the voltage ,therefore this confirms the circuit have capacitor . Thus Z is may be the combination of capacitor and resistor Or

the combination of capacitor,resistor and inductor ( Xl≤Xc)

Answer 2

Given: Lor R or any other combination, an ac voltage  in an ac voltage

E = Eo sin(ωt+Ф), l = lo sin ωt+Ф+π/4.

To find: The unknown element in the box may be​?

Solution:

• So we have given the function:

             E = Eo sin(ωt+Ф)

             l = lo sin ωt+Ф+π/4.

• Now we can see that the current is leading the voltage by π/4.

• So now, the load should have the capacitor.

• Also we know that the Z is the summation of resistance and the capacitor.

• Also we can say that Z is the combination of:

              capacitor , inductor and reistance

• By the following condition:

             X(capacitor) > X(inductor)

Answer:

           The unknown element in the box may be​ either Capacitor, resistor and inductor or only capacitor and Resistor.