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Práctica
Características de elementos no ohmnicos
Objetivo:
Dibujar la curva característica de varios elementos no ohmnicos en un gran intervalo de temperatura.
Estimar la resistencia de una bombilla a temperatura ambiente a partir de la curva característica.
Estimar la temperatura a la que trabaja la bombilla.
Base teórica:
R · I = V
La relación entre resistencias de un mismo elemento en función de la temperatura es la siguiente:
R = R0 ( 1 + T )
Material:
1 Tester.
Cables de conexiones.
Procedimiento:
A
V
Resistencia
No ohmnica
Datos:
Bombilla:
I (mA)
V (V)
0
0
54.8
0.04
173.3
0.27
198
0.57
235
0.92
290
1.49
311
1.77
365
2.4
395
2.8
363
-2.4
410
-3.05
470
-4
A
V
R1 R2
Tomamos una medida de A y otra de V y aplicamos la ley de Ohm.
Este resultado es bastante parecido al que obtenemos aplicando la fórmula de la resistencia equivalente a resistencias conectadas en serie.
Parte3:
Conectamos las resistencias en paralelo del siguiente modo:
R2 A
R1
V
En este circuito el tester en función de amperímetro se conecta a una resistencia primero y después, una vez tomada la intensidad, se conecta a la otra. Luego, se suman los valores.
En este momento es cuando falló la alguna conexión y se fundió el fusible del tester.
En todo caso, la resistencia total calculada a partir de la ley de Ohm tendría que ser la misma calculada según la expresión siguiente:
Conclusiones:
Aún no sé que falló para que la realización de la práctica se detuviera en seco. Intenté con otra caja de conexiones, sin utilizar caja (que por cierto es bastante peligroso) y monté y desmonté el circuito varias veces seguidas. Al final nada funcionó y no sé si provoqué un cortocircuito, las conexiones estaban dañadas o si los aparatos funcionaban correctamente. El caso e que algo salió mal.
Los pocos resultados que logré obtener son a mi parecer bastante satisfactorios.
A
R
V
Procedimiento:
Datos:
I (mA)
0,5
1
1,49
2,01
2,58
3
3,47
4,01
V (V)
0,25
0,47
0,7
0,93
1,21
1,38
1,64
1,89
I (mA)
4,52
5,07
5,54
6,05
6,47
6,98
7,51
7,99
V (V)
2,12
2,4
2,61
2,82
3,01
3,27
3,51
3,73
Cálculos:
Pendiente = 0, 467 V/ mA = 467 !
Descargar
Enviado por: Aleix Idioma: castellanoPaís: España