resistance coil
 電阻線圈


 Re·sist·ance n.
 1. The act of resisting; opposition, passive or active.
    When King Demetrius saw that . . . no resistance was made against him, he sent away all his forces.   --1. Macc. xi. 38.
 2. Physics The quality of not yielding to force or external pressure; that power of a body which acts in opposition to the impulse or pressure of another, or which prevents the effect of another power; as, the resistance of the air to a body passing through it; the resistance of a target to projectiles.
 3. A means or method of resisting; that which resists.
    Unfold to us some warlike resistance.   --Shak.
 4. Elec. A certain hindrance or opposition to the passage of an electrical current or discharge offered by conducting bodies. It bears an inverse relation to the conductivity, -- good conductors having a small resistance, while poor conductors or insulators have a very high resistance. The unit of resistance is the ohm.
 Resistance box Elec., a rheostat consisting of a box or case containing a number of resistance coils of standard values so arranged that they can be combined in various ways to afford more or less resistance.
 Resistance coil Elec., a coil of wire introduced into an electric circuit to increase the resistance.
 Solid of least resistance Mech., a solid of such a form as to experience, in moving in a fluid, less resistance than any other solid having the same base, height, and volume.

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