Here's a overview and guidance for the emitter-f circuit described: Circuit Objective Control the speed your car motor on the light intensity a CDS cell- Use the120 power transistor exercise 23. - circuit should spin the motor at a proportional to light. # Components - TIP Darlington transistor - CDS cell (photoresistor) - 10kΩ resistor - Power transistor (TIP120) - Power supply (+6V) - Motor (represented as \(m\)) - Ground connection # Circuit Description - The CDS cell is connected in series with a resistor (\(R_{CDS}\)) to form a voltage divider. - The junction between the CDS cell and resistor connects to the base of the TIP120 transistor. - The emitter of the TIP120 connects to the motor. - The collector of the TIP120 connects to +6V. - The other terminal of the motor connects to ground. # Working Principle - Light intensity affects the CDS cell resistance, changing the voltage at the transistor's base. - Increased light results in a higher base voltage, turning the TIP120 on more strongly. - This causes more current through the motor, increasing its speed. - Adjusting the light on the CDS controls the motor speed. # Important Notes - Ensure the lower node of the 10K resistor is connected to ground. - The circuit uses the TIP120's Darlington configuration for high current control. - Properly connect the power supply and verify component ratings. Would you like a detailed schematic diagram or step-by-step assembly instructions?