El voltímetro es el aparato que mide tensiones y, por lo tanto, permite saber con cierta precisión si en una instalación tenemos 110 V, 220 V u otra tensión cualquiera.

Además de multímetros de bajo costo que son útiles para el electricista voltímetros también se pueden encontrar en las casas de materiales eléctricos.

    En la figura 1 mostramos un voltímetro barato de electricista que es del tipo de "hierro móvil".

 


 

 

   Este instrumento opera satisfactoriamente con tensiones alternantes como la de las instalaciones y posee la precisión necesaria para los trabajos de instalación doméstica e incluso comercial de pequeño porte.

   En una escala graduada, tenemos un puntero que indica cuál es la tensión que se está aplicando al circuito. Esta tensión se mide apoyando las puntas de prueba del instrumento en la toma o en los hilos de la instalación.

  Nota: actualmente existen algunos tipos comerciales con escalas de LED e incluso indicadores digitales a precios bastante bajos.

 

 

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