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In page Radio-controlled car:

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Electrically powered models utilize mechanical speed controllers (MSC's)[1] or electronic speed controllers (ESC's)[2] to adjust the amount of power delivered to the electric motor. The power delivered is proportional to the amount of throttle called for by the transmitter—the more the trigger is pulled, the faster it goes. The voltage is "pulsed" using pulse-width modulation to produce varying output with smooth transitions and greater efficiency. Electronic speed controllers use solid state components that regulate the duty cycle, adjusting the power delivered to the electrical motor. In addition, most electronic speed controllers can use the electric motor as a magnetic brake, offering better control of the model than is possible with a mechanical speed control.[citation needed]