## Thursday, February 28, 2013

### Krichoff&#039;s Voltage Law

Introduction
In this experiment we allow for analyze two truly common circuits configuration: serial resister and couple resisters. we will se that serial publication resistors acts like a potential difference divider, and parallel resistors act like a current divider. Also series and parallel resistors provide homogeneous currents. In the betoken 1 below three resistors R1, R2 and R3 are in series. with a potency source on the left. Kirchoffs Voltage Law states that the sum of potentiality around a loop is equal to zero. at present bounce the loop in simulacrum one we can enunciate that;
- Vs +V1 + V2 + V3 = 0
Where V1, V2 and V3 are quintage across resistors R1, R2 and R3. since the current across the series loop is always the similar current across to each one resistor is Is.

Vs = V1+V2 +V3
Vs = Is.R1 + Is.R2 +Is.R3
Req = R1 +R2 +R3

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Kirchoffs current Low
Kirchoffs Current Low states the sum of the currents difference or entering a node is equal to zero. Now if we consider a circuit in figure 2 where 3 resistors R1, R2 and R3 are in parallel with a voltage source. The voltage across each of the resistors will be the same but the currents divides. Considering the single node circuit illustrated in figure 2. KCL for Parallel resistors
-Is + I1 +I2 + I3 = 0
Is = I1 +I2 + I3
Is = V / R1 + V / R2 + V / R3
or, Is / V = 1 / R1 + 1 / R2 + 1 /R3
or, 1/ R eq = 1 / R1 + 1 / R2 + 1 /R3

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Procedure
1. The equivalent Resistance of each figure 4A, 4B and 4C are reason.
2. for each one of the resistors in the figure 4A, 4B and 4C are cross out up seperately and equivalent voltage was thrifty using ohmmeter. Each measured resistors are recorded in the disconcert 1.
3. In the figure below X represent the 5 volt applied and Y represent the ground. Then current was calculated for each figure and measured using ammeter in table 1.
4. Each resistors in each figure was replaced by equivalent voltage using Decade Box and current was measured using ammeter.

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