The iphone- 11 has the capacitance C = 2 nF, and the source current IDD = 9 mA. When VDD = 0.8 V, the iphone -11 can be operated at 1 GHz. When we reduce VDD to 0.6 V, the iphone-11 can work only at 800 MHz. What is the power consumption of iphone-11 working at 1 GHz ? What is the power consumption of iphone-11 running at 800 MHz?