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PRÁCTICA NÚMERO 11
RESISTENCIA DE UN VOLTÍMETRO
· OBJETIVO:
Calcular gráficamente la resistencia interna de un voltímetro
· DESARROLLO:
Montar el circuito de la figura, conectando la resistencia más baja y anotando la indicación del voltímetro. Sucesivamente se va aumentando el valor de la resistencia y se anotan los valores del voltaje V y su inverso 1/V, junto con sus errores.
RESISTENCIAS
ERROR( ð )
TENSIÓN (V)
ERROR( ð )
1/V
ERROR( ð )
430
10%
4,7
0,1
0,212765957
0,368521448
620
10%
4,5
0,1
0,222222222
0,384900179
910
10%
4,3
0,1
0,23255814
0,402802513
1500
10%
3,9
0,1
0,256410256
0,444115592
2400
10%
3,6
0,1
0,277777778
0,481125224
2700
10%
3,3
0,1
0,303030303
0,524863881
3300
10%
3,1
0,1
0,322580645
0,558726067
3900
10%
2,8
0,1
0,357142857
0,618589574
4300
10%
2,7
0,1
0,37037037
0,641500299
4700
10%
2,6
0,1
0,384615385
0,666173388
· El significado físico de la ordenada en el origen se deduce de la manera siguiente:
Si cada punto corresponde a dos coordenadas de la forma (resistencia, 1/V), el punto en que R = 0 es el punto de corte con el eje Y, y por lo tanto si R es 0, el valor del punto de corte equivale a la diferencia de potencial entre los extremos de la pila, es decir, su fuerza electromotriz.
· La deducción del error de 1/V se ha efectuado de la manera siguiente:
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Enviado por: Antonio Oliver Idioma: castellanoPaís: España