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I done a wireless robo control project in that output of the micro controller is given to the transisters and the emitter output of the transister is given to the relay & the relay output is given to motor.
But my question is why we use relays even we are getting sufficient current and voltage from the transisters to drive motors?
if you are using 6v /12v/ or more volts motor then u can control this through your microcontroller .which gives only 5v and less current.
Advantages of relays: Relays can switch AC and DC, transistors can only switch DC. Relays can switch high voltages, transistors cannot. Relays are a better choice for switching large currents (> 5A). Relays can switch many contacts at once.