A voltage reference circuit connected to a 15 V15\text{ V}15 V DC rail uses a Zener diode with a Zener voltage of VZ=6.8 VV_{\text{Z}} = 6.8\text{ V}VZ=6.8 V. The Zener diode requires a minimum operating current of 5.0 mA5.0\text{ mA}5.0 mA to maintain its breakdown voltage. In this circuit, a series current-limiting resistor RRR is connected between the 15 V15\text{ V}15 V supply and the Zener diode, which is connected to 0 V0\text{ V}0 V.
Deduce whether a 150 Ω150\ \Omega150 Ω, 0.40 W0.40\text{ W}0.40 W resistor is suitable for RRR in this circuit.
