#### Torque or moment or moment of force is the tendency of a force to rotate or move an object about an axis. A force is a push or pull, like wise torque is a twist to an object. Mathematically, Torque, T = F × r.

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r = radius of the armature in m

N = speed of the armature in r.p.m. = N / 60 r.p.s

Work done / revolution = force × distance moved per revolution

r = radius of the armature in m

N = speed of the armature in r.p.m. = N / 60 r.p.s

Work done / revolution = force × distance moved per revolution

#### The expression for voltage in d.c. motor is given by

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**V = E**_{a}
+ I_{a
}R_{a }( multiply throughout by I_{a })

_{a}+ I

_{a }R

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