27. Resistors & DC Circuits

Draw a circuit diagram for the circuit of FIGURE EX28.2.

Suppose that you wish to apply a 0.25-V potential difference between two points on the human body. The resistance between those two points is about 1800 Ω, and you only have a 1.5-V battery. How can you connect up one or more resistors to produce the desired voltage? This is another example of a voltage divider (Problem 20).

At time t = 0, the switch in the circuit shown in Fig. 30–30 is closed. After a sufficiently long time, steady currents I₁, I₂, and I₃ flow through resistors R₁, R₂, and R₃, respectively. Determine these three currents.