| Definition of 'tangent law' |
The Standard Electrical Dictionary |
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1. tangent law
In a galvanometer the tangents of the angles of deflection of the needle are proportional to the deflecting force--
I. When the controlling force is unaltered in absolute magnitude and direction by the motion of the needle.
II. When the deflecting force acts at right angles always to the controlling force.
These conditions are usually secured by having the actuating coil through which the current passes flat and of large diameter compared to the length of the needle; by using the uniform field of the earth as the control; by having a short needle; by placing the coil with its plane in the magnetic meridian.
For best proportions of tangent galvanometer coils see Bobbins.
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Definitions of tangent law
