Question

13.
What are ohmic and non ohmic devices?
14.
Write the formula for the phase difference between in series LCR ciciut.
15.
Draw the phasor diagram for pure inductive circuit.​

Answer 1

Answer:

13. An Ohmic device is one which obeys Ohm's Law, V = IR, where R is constant. A non- Ohmic device is one that does not have a constant resistance. A light bulb is a simple example; the filament undergoes huge changes in temperature when current passes through it.

14. Let the phase difference between applied voltage and current in series LCR circuit be ϕ.

Thus, tanϕ=

iR

i(X

L

−X

C ) =

R

X

L

−X

C

Thus, it is positive for X

L

>X

C .

15. The circuit which contains only inductance (L) and not any other quantities like resistance and capacitance in the circuit is called a Pure inductive circuit. In this type of circuit, the current lags behind the voltage by an angle of 90 degrees.