A circuit consist of three resistors with R1 20 resistance R2 30 and R3 50 and 125V battery connected and an emf source. Find out the (1) equivalent resistance, (2) the current across each resistor, (3) potential drop across each resistor and (4) the power dissipated in each resistor.

Application Problem. A battery pack consisting of n 12V voltage cells connected in par- allel is shown in Figure 1.144. This battery pack is to provide a load current IL of at least 11.5A to the 12 load resistor RL as shown. Assuming that all voltage cells are identical with an open circuit voltage Ei of 12V and an internal resistance Ri of 0.32, calculate the number of cells n needed to provide a minimum of 11.5A to R1; that is, IL 2 11.5A. battery pack + E, E = 12V R= 0.30

2. A bank of nickel-cadmium cells is used as the emergency lighting supply for a hospital. There are 100 cells connected in series and each has an A-hr rating of 120 A-hr. The bank has to be replaced, and the manufacturer is no longer supplying nickel-cadmium cells. It is decided to replace the cells with lead-acid cells. How many lead-acid cells will be required if each has an A-hr rating of 60 A-hr, and how should they be connected?

A 0 – 150 voltmeter has a resistance of 2000-ohms per volt.  It is desired to change this voltmeter to a 0 – 600 volt instrument by the edition of an external multiplier. What is the resistance, in ohms, of this external multiplier?