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# Belts - Power Transmission and Efficiency

The torque available at the driven wheel or pulley (a) can be expressed as

T = (F2 - F1) ra                        (1)

where

T = torque (Nm)

F = force (N)

r = radius of wheel or pulley

The available power can be expressed as

P = T ωa = (F2 - F1) ra ωa                          (2)

where

P = power transmitted (watts)

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