# Force in a string attached tangential to a servo

If I'm using a servo with a string attached to it (while the string is attached to another object) the string is attached tangentially at about 1.5cm from the centre of the servo and the servo draws 270 milli Amps and has 5V supplied to it (while having an angular velocity of pi/10) can I find the force in the string by doing the following: using P=IV find the power of the servo then using angular velocity = linear velocity x radius work out the linear velocity of the string, then using P = FV find the force in the string?

Thanks for helping out!

Although $$P= IV$$ is related to the energy and theoretically you can find the Force through the use of $$P= F\cdot V$$ there are at least two problems both related with the conversion of electrical energy to actual work:
1. power factor or Cos $$\phi$$
You probably know that the power factor is defined as $$P=\frac{\text{active power }[W]}{\text{apparent power}[VA]}$$. The cos $$\phi$$ indicates how much apparent power is converted to actual power. The remaining power is usually stored as inductive or capacitative energy in the circuit.