8. ht The following description of a circuit appears in your experimental laboratory manual. You are required to set the circuit up in order to do an experiment. Before you set up the circuit your teacher asks you to draw, using standard symbols, a circuit diagram of the circuit. In the space provided draw a labelled circuit diagram for the described circuit in the space below. The source of potential difference is two 3V cells connected in series to a switch and two 500 resistors. These components are also in series with three light bulbs in parallel to each other. A variable resistor is placed in series with one of the light bulbs. An ammeter is needed to measure the total current in the circuit. The potential difference across the whole parallel network and across one of the 1000 resistors is to be measured as well.

Part D

A battery is connected to three resistances 5 ohm, 4 ohm & 3 ohm which are connected in series.  a. Find the effective resistance of the circuit? b. Suppose 5 ohm resistor has a voltage of 12 V across it. What is the value of current through each of the resistors? c. What is the value of the battery voltage?

a) Write an equation for the currents entering in/out of the top junction in Figure 1. Use I1 as the current coming from the left, I2 as the current going downward, and I3 as the current going to the right. b) You can draw three loops in order to solve this circuit. Write the corresponding voltage equations for these loops in terms of V1, V2, VA, and VB; where VA and VB are voltages across the resistors RA and RB respectively. c) Using Ohm's law combined with the equations you found above; express I1, I2, and I3 as equations in terms of the know quantities V1, V2, RA, and RB. d) Now you have all the information you need to express VA and VB as equations in terms of V1, V2, RA, and/or RB.