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how to calculate torque using Amp., volt & RPM?

I want to plot a torque Vs. time graph. of DC motor. I can measure Motor RPM, Current as well as Applied DC Voltage. Help me to calculate torque out of this.
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Check out the link below. It has several formulas that will help you calculate torque.

Motor Formulas
http://www.elec-toolbox.com/Formulas/Motor/mtrform.htm

Regards,

Todd D.
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