Your cell phone typically consumes about  410 mW of power when you text a friend. If the phone is operated using a lithium-ion battery with a voltage of 3.7 V, what is the current (in A) flowing through the cell-phone circuitry under these circumstances?

Consider the circuit shown in Figure Q11(a), a battery Vs = 15V with an internal resistance Rs is connected to a load resistance RL. Rs + Is RL Vs VL Figure Q11(a) (a) If a load resistance RL = 400 Q is connected, VL= 10 V is measured. (i) Find the current Is flowing in the circuit. (ii) Determine the value of the internal resistance Rs. (iii) What is the power dissipated in the load resistor RL?

In the circuit diagram R1 = 5R and R2 = 15R, where R = 14 Ω. The power dissipated in resistor 2 is P = 1.6 W.  Part (a)  What is the voltage across the battery in volts?  Part (b)  How much power, Ps, is the source supplying, in watts?

Your design team is analyzing whether solar panels can provide sufficient energy to run the buoy’s electronics. For this design your team selects a 6V @ 333mA (2W) Solar Cell and a 3.7V 1200mAh battery. Because the solar cell, battery, and electronics operate at different voltages, regulators must be applied to the circuit to ensure the voltages are compatible. Assume the regulators are 90% efficient. (A) how many hours of daylight are needed to charge the battery? (B) If the buoy’s electronics are supplied solely from the battery, how many hours will the electronics operate if they draw 200mA continuously?