# The motor of the electric locomotive when driving at a speed of 72 km / h consumes a power of 600 kW

The motor of the electric locomotive when driving at a speed of 72 km / h consumes a power of 600 kW, determine the efficiency of the power plant of the electric locomotive if the traction force is 24 kN.

These tasks: V (speed of the considered electric locomotive) = 72 km / h (in SI V = 20 m / s); Nc (power consumed by an electric locomotive for operation, power expended) = 600 kW (600 * 10 ^ 3 W); F (pulling force) = 24 kN (24 * 10 ^ 3 N).

The efficiency of the power plant of the considered electric locomotive is calculated by the formula: η = Np / Nc = F * V / Nc.

Let’s calculate: η = 24 * 10 ^ 3 * 20 / (600 * 10 ^ 3) = 0.8 or 80%.

Answer: The power plant of the electric locomotive in question has an efficiency of 80%.

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