# The electric train, when moving at a speed of 54 km / h, consumes 9000 kW of power.

March 23, 2021 | education

| **The electric train, when moving at a speed of 54 km / h, consumes 9000 kW of power. The efficiency of electric motors is 80%. Determine the traction force developed by electric motors.**

Initial data: V (speed of the electric train) = 54 km / h (15 m / s); Np (power consumed by an electric train) = 9000 kW (9000 * 10 ^ 3 W); η (efficiency of electric train motors) = 80% (0.8).

The traction force developed by the electric motors can be expressed from the formula for calculating the efficiency: η = F * V / Np, whence F = Np * η / V.

Calculation: F = 9000 * 10 ^ 3 * 0.8 / 15 = 480,000 N (480 kN).

Answer: Electric motors develop a traction force of 480 kN.

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