Question

answer questions #2 & #3 .

Central State University Wilberforce, Ohio 45384 MFE 3510, Circuit Analysis Experiment 4 Obiectives After performing this experiment, you will be able to: 1. Apply the superposi 2. Construct a circult with two voltage sources, circuit, and verify your computation by measurement. tion theorem to linear circuits with more than one voltage source. solve for the currents and voltages throughout the Materials Needed: Resistors: One 4.7 kQ, one 6.8 kn, one 10.0 kQ Summary of Theory To superimpose something means to lay one thing on top of another. The superposition theorem is a means by which we can solve circuits that have more than one independent voltage source. Each source is taken, one at a time, as if it were the only source in the circuit. All other sources ane replaced with their internal resistance. (The intermal resistance of a de power supply or battery can be considered to be zero). The currents and voltages for the first source are computed. The results are marked on the schematic and the have been taken, the overall and voltages is computed. Currents that are in the same direction are added; those that are in opposing directions are subtracted with the sign of the larger applied to the result. Voltages are is repeated for each source in the circuit. When all sources can be solved. The algebraic sum of the superimposed currents treated in a like manner The superposition theorem will work for any number of sources is to assign a polarity, right or wrong, to each component. Tabulate any current One way to keep the accounting is in the same direction as the assignment as a positive current and any current which o the assigned direction as a negative current. When the final algebraic sum is currents are in the assigned direction; negative currents are in the opposite direction of the assignment. In the process of replacing a voltage source with its zero internal resistance, you may completely short out a resistor in the circuit. If this occurs, there will be no current in that resistor for this part of the calculation. The final sum will still have the correct current pposes completed, positive Procedure: 1. Obtain the resistors listed in Table 10-1. Measure each resistor and record the measured value in Table 10-1 2. Construct the circuit shown in Figure 10-1. This circuit has two voltage sources connected to a common reference ground.

Answer 1

2) If the algebric sum is negative, it indicates that the assumed direction of current is wrong and the direction of current is reversed.

3) When we apply node analysis, we consider all the current going outside and positive. But if we get all currents as negative after doing the problem then it indicates that the current is entering the node.