Lab 1 - ENEL 280 - eletrical circuits

8/16/2019 Lab 1 - ENEL 280 - eletrical circuits

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Summary:

The ampacity of conductor is how much current a conductor can carry before deterioration. It

depends on resistance, insulation and frequency of current and heat. The main aim of our

experiment was to design electric circuit in series and through ohm law we would find relation

between current and voltage.

Objective

In the experiment the objective is measure the current, voltage and power across the resistorthrough connecting devices in series.

After circuit setup, we would then find power disspation.

Equipment & Components required

Digital ultimeterIndustrial experiment board

!onnecting wires

D! power "upply

Test Method:

#$ %e first ma&e sure each resistors of #'( lamps should have approximated ) *hms.

'$ %ith voltage source being set to #'v. %e connect # lamp and measure its current and

voltage drop, then we connect the 'nd lamp in series with it and do same procedure for + rd

one.+$ (oltage also drops from #' ( to ( then )(.

)$ -sing ohm law we find resistance of each lamp.

$ %e then find power dissipation and calculate its total.


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• -sing the D, measure the *// resistance of the #'( lamps

0esistance1

2amp #1 0esistance 3 ) 4.

2amp '1 0esistance 3 ).' 4

2amp +1 0esistance 3 ) 4.

(oltage1

2amp #1 (oltage 3 #'(

2amp '1 (oltage 3 #'(

2amp +1 (oltage 3 #'(

!urrent1

2amp #1 (30.I I3#'5) 3 +A

2amp '1 (30.I I3#'5).' 3'.6A

2amp +1 (30.I I3#'5) 3 +A

2amp #, 2amp ' and 2amp+ in "eries

!urrent1 7.86A

(oltage1 #'(

0esistance1 #'.'4

• !alculate expected power dissipation for each case. !alculate the total power

2amp # 9 3 I: . 0 3 +: . ) 3 + %

2amp ' 9 3 I: . 0 3 '.6: . ) 3 +',8'%

2amp + 9 3 I: . 0 3 +: . ) 3 + %

9total 3 I:;# %

• "et the power supply to #'( and connect # lamp. easure the current and the voltage

drop with the D, then calculate the *? resistance

(oltage1

2amp # 3 #'(

2amp # ; 2amp ' 3 #'(

2amp # ; 2amp ' ; 2amp + 3 #'(


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!urrent1

2amp # 3 7.+76A

2amp # ; 2amp ' 3 7.'7A

2amp # ; 2amp ' ; 2amp + 3 7.#)A

(oltage Drops1

2amp #1 ( 3 0I 3 ) . 7.+76 3 #.'+'(

2amp # ; 2amp ' 3 ( 3 0I 3 ).' . 7.'7 3 7.6'(

2amp # ; 2amp ' ; 2amp + 3 ( 3 0I 3 ) . 7.#) 3 7.(

• !alculate the power dissipation for each case, based on your measurements. !alculate the

total power dissipation

9ower dissipation for1

2amp # 3 7.+6%

2amp # ; 2amp ' 3 7.+%

2amp # ; 2amp ' ; 2amp + 3 7.++%

0eal 9ower1

2amp # 3 +).'%

2amp # ; 2amp ' 3 #>.'%

2amp # ; 2amp ' ; 2amp + 3 ##.'%

Analysis:

It is possible to observe that after flow in there is potential drop across circuit. And also the

power in the circuit is less than the expected power because the resistance will &eep some energy

for it.

Conclusion/discussion:

%e noticed that the resistance values found in calculations were different then the values wemeasured with the multimeter. That difference occurs because off the temperature@ when turned

on, the 2D glows and slowly starts to get warmer, and this heating increases the former

resistance of the 2D, ma&ing the difference between the two values.


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?ame1 /elipe (ieira !amargo

ID1 '77+8#

!lass and "ection1 nel '67 B 78#

2ab1 7#

Date1 ay ', '7#

Croup embers 1 "huaihao hao

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Lab 1 - ENEL 280 - eletrical circuits