Final answer:
To adjust Vt and RR, you manipulate the resistance in the circuit. Adjusting the applied voltage may also be necessary to achieve the appropriate current value.
Step-by-step explanation:
In order to adjust Vt (threshold voltage) and RR (series resistance), you would manipulate the resistance in the circuit. By changing the resistance, you can adjust the time constant (RC constant) of the circuit. A higher resistance value will result in a longer time constant, while a lower resistance value will result in a shorter time constant.
Additionally, an adjustment of the applied voltage may be needed to ensure that the current delivered has an appropriate value. The applied voltage is related to the current through Ohm's Law (V = IR), so by adjusting the voltage, you can control the current flowing through the circuit. This can help ensure that the current delivered is within the desired range.