LAB REPORT

CIRCUIT THEORY II

EXPERIMENT 7

PARALLEL R, L,C CIRCUITS

MERT AĞALDAY

120403007

EEE202

18.05.2015

Data Tables

RC Circuit

Theory Experimental % Deviation

XC -1.59kj -1.6kj 0,63

Z Magnitude 846.1 846 0,011

Z θ -32.2 -32.1 0.31

Theory Mag

Theory θ Exp Mag Exp Delay Exp θ% Dev Mag

% Dev θ

iC 6.3m 90 6.1m 2.40us 89.8 -2.85 -111m

iR 10m 0 9.0m 2.40us 0 -11 0

iin 11.8m 32.2 11.2m 2.40us 31.8 -3.38m-

931.6m

RL Circuit

Theory Experimental % Deviation

XL 628.3j 627 j 0.2

Z Magnitude 531.59 530 j 0.3

Z θ 57 56.5 j 0.87

Theory Mag

Theory θ Exp Mag Exp Delay Exp θ% Dev Mag

% Dev θ

iL 15.9m -90 -15.5m 100us -89.5 -1.88 -222m

iR 10m 0 9.5m 100us 0 -5 0

iin 18.75m -57.8 18.5m 100us -58.5 -4 519m

RLC Circuit

Theory Experimental % Deviation

XC -1.59ki -1.60ki 0.6

XL 628.3i 627 i 0.2

Z Magnitude 719.97 720 0,004

Z θ -43.87 -44.1 0.52

Table 7.5

Theory Mag

Theory θ Exp Mag Exp Delay Exp θ% Dev Mag

% Dev θ

iC 6.3m 90 6.1 100us 89.8 -2.85 -111m

iL 15.9m -90 -15.5 100us -89.8 -1.18 -222m

iR 10m 0 9.5m 100us 0 -6 0

iin 13.8m 43.8 14.1m 100us 44.1 1.49 456.6m

Table 7.6

Questions

1. What is the phase relationship between R, L, and C components in a parallel AC circuit ?

2. Based on measurements, does Kirchhoff’s Current Law apply to the three tested circuits (show work) ?

- KCL was applied on three tested circuits.

- RC circuit : iT = iR + iC

- RL circuit : iT = iR + iL

- RLC circuit : iT = iR + iL + iC

3. In general, how would the phasor diagram of Figure 7.1 change if the frequency was raised ?

- If the frequency was raised in RC, phase angle would be increasing.

IC

f = 1 kHz

f = 500 Hz

IR

4. In general, how would the phasor diagram of Figure 7.2 change if the frequency was lowered ?

- If the frequency was lowered in RL, phase angle would be increasing.