why in galvanometer the null or zero point starts at centre but in case of ammeter and voltmeter the readings start from one corner in the devices.
Answer (1)
28th Jan, 2020
Hello,
Galvanometer is sensitive to direction of flow of current. Galvanometer shows 0 when no current passes through it. If current passes from positive pole to negative pole then deflection is positive. If current passes from negative pole to positive pole deflection is negative. Galvanometer therefore shows both direction and magnitude of current.
Ammeter only quantitatively shows amount of current and not direction of current flow whereas voltmeter shows potential difference between two poles. Thus these values do not show negative deflection. So, galvanometer has 0 at centre to show direction of current whereas ammeter and voltmeter show 0 at an end as they do not show the direction in which current is flowing.
Hope this helps.
Galvanometer is sensitive to direction of flow of current. Galvanometer shows 0 when no current passes through it. If current passes from positive pole to negative pole then deflection is positive. If current passes from negative pole to positive pole deflection is negative. Galvanometer therefore shows both direction and magnitude of current.
Ammeter only quantitatively shows amount of current and not direction of current flow whereas voltmeter shows potential difference between two poles. Thus these values do not show negative deflection. So, galvanometer has 0 at centre to show direction of current whereas ammeter and voltmeter show 0 at an end as they do not show the direction in which current is flowing.
Hope this helps.
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