Technician A says that the blower speed can be varied by using a resistor pack. Technicial says that the blower motor speed can be varied by using pulse width modulation. Who is correct? a. Technician A b. Technician B c. Both Technician A and Technician B d. Neither Technician A nor Technician B

c. Both Technician A and Technician B<br /><br />Both Technician A and Technician B are correct. The blower speed can be varied by using a resistor pack, which changes the resistance in the circuit and thus the current flowing through the blower motor. This changes the speed of the motor. Pulse width modulation (PWM) is another method to vary the blower motor speed by changing the width of the pulses that control the motor's operation.