Every movement requires energy, this is why Electric Power Steering only acts when it is needed. To give you more bends per litre, an electric motor is used to assist the steering. However, unlike conventional hydraulic systems, Electric Power Steering is supported by an electric motor which helps to ensure that energy is only used during actual steering manoeuvres. If the steering wheel is kept in a constant position when driving straight ahead or cornering, the electric motor is inactive and therefore does not use any energy.
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