# Practica 2 circuitos

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• Publicado : 16 de febrero de 2012

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Index

Objective ... ... ... ... ……….. ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... .3

Material and equipment .... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... 3

I. - Theoretical Introduction ......... ... ... ... ... ... ... ... ... ... ... .... ... ... ... ... 3

II .- Development of practice ... ............... ... ... ... ... ... ...... ... .... ... ... ... 5

II.1 .- Voltage Unit ... ... ... ... ........................................ .... ... ... ... ... ... .. 5

II.2 .- Dependence of the resistance .. ... ....................... ... .... ... ... ... ... .. 5

III .- Calculations ... ... ... ... ... ... ......... ... ... ... ... ... ... ... ... ... ... ... ... ... .8

IV .- Simulations ... ... ... ... ... ..................... ... ... ... ... ... .... ... ... ... ... ... 9

V. - Comparison of calculated values, measured and simulated .. ... ... .. 15

VI .- Questionnaire ... ... ... ... ............. ... ... ... ... ... ... ... ... ... ... ... ... ... .16

VII .- Conclusions ... ... ... ... ............... ... ... ... ... ... ... ... ... .... ... ... ... .. 17

VIII .- Bibliography ... ... ...... ............ ... ... ... ... ... ... ... ... ... ... ... ... ... 17

Objective:

The student will understand and handle the proper interpretation of Ohm's law, that at the end of practice, is in scope:
• Calculate the voltages, currents, powers and resistances that are present in a circuit.
• Understanding the behavior of current with the voltage.
• Understanding the behavior of currentwith respect to resistance.
• Derive Ohm's law.

Material:

• 1K ohm resistors ¼ watt and 1 Ω to 1 watt.
• Wires for connections.
• 4 Tips banana - alligator.
• 2 points Alligator - alligator.
• Tweezers and cutting edge.
• 1 pot of 2.5 kilohms or higher.

Team:

• 1 digital multimeter.
• 1 variable voltage source.

I. - Theoretical Introduction

OHM'S LAW
Ohm'sLaw, postulated by German mathematician and physicist Georg Simon Ohm, is one of the fundamental laws of electrodynamics, closely linked to the values ​​of the basic units present in any electrical circuit including:
1. Voltage or voltage "E" in volt (V).
2. Intensity of the current "I" in ampere (A).
3. Resistance "R" in ohms () or consumer of the load connected to the circuit.
4. Voltage orvoltage "E" in volt (V).
5. Intensity of the current "I" in ampere (A).
6. Resistance "R" in ohms () or consumer of the load connected to the circuit.
Due to the existence of materials that make it more difficult than others passing electrical current through them, when the value of resistance varies, the value of the current in ampere also varies inversely. That is, as the resistanceincreases the current decreases and vice versa, when resistance to current flow decreases the current increases, provided that in both cases the value of the voltage or voltage constant.

Furthermore and in accordance with the Act itself, the value of the voltage or voltage is directly proportional to the intensity of the current, so if the voltage increases or decreases the amperage of the currentflowing through the circuit will increase or decrease in the same proportion as long as the value of the resistor connected to the circuit remains constant.
General assumption of Ohm's Law
The current flow in amperes flowing in a closed electrical circuit is directly proportional to the voltage or applied voltage and inversely proportional to the resistance in ohms of the load is connected.
Generalmathematical formula to represent the ohm law

From the mathematical point of view the proposition above can be represented by the following general formula for Ohm's Law:

Alternative practice:
Those less related to the clearance of mathematical formulas can also perform calculations of voltage, current and resistance for Ohm's Law, an easier way using the following practical resource:...