Determining Resistor Specifications and Identifying Node Components

1. A color coded resistor has the following stripes: blue orange red gold. Determine the nominal value of this resistor. Give your answer in unit prefix notation.

2. You need a 10%10  ? What is the color coding for this resistor?

3. You measure the resistor value of3  ?for a resistor with the following color coding:

red red red silver

Use the % error formula given in the lab handout to determine whether or not this resistor is within specifications. Show your work.

4. Consider Figure 5. Determine Vxgiven the voltages displayed in DMM1 and DMM2.

5. Consider Figure 6. Determine the current Ixythrough R5 given the following currents displayed in DMM1, DMM2, or DMM3.

6. Figure 8 shows two common mistakes when wiring Circuit 1 on the breadboard. What is the error in each incorrect method and why will this error not give you what you expect?

7. Consider Circuit 1 in Figure 7 and the “Correct Method” for building Circuit 1 given in Figure 8.

State whether the wire or pin hole indicated is part of node a, part of node b, neither part of node a nor node b, or part of both node a and node b.

8. Consider Circuit 1 in Figure 7. The handout gives you the value for the supply voltage Vsand the nominal value for R1. According to this schematic, the voltage drop Vab across R1 is equal to the supply voltage Vs for this circuit. Use these values to determine the expected value for the current Iab passing through R1. Record this expected value for Iab in the Data Sheet. Use unit prefix notation.

9. In problem 8, it was stated that the voltage drop Vabacross R1 is equal to the supply voltage Vs in Circuit 1 of Figure 7.

This is true because the power supply + is connected to node a and the power supply – is connected to node b. R1 is also connected to nodes a and b. That means the power supply and R1 are connected (fill in the blank), which means they have the same voltage drop.

1. in series
2. in parallel
3. both in series and in parallel
4. in neither series nor in parallel

10. T or Fideally, instrumentation used to make current or voltage measurements should never modify the circuit being probed.

11. The circuit model for a good Voltmeter is
    1. an open (that is, a very large resistor > 10M  )

1. a short (that is, as very small resistor < 0.1  )

12. The circuit model for a good Ammeter is
    1. an open (that is, a very large resistor > 10M  )

1. a short (that is, as very small resistor < 0.1  )

13. Use Ohm’s Law to explain why Voltmeters are relatively hard to damage (in this lab at least) compared to Ammeters. Keep in mind the DMMs used in this lab are not designed to take a lot current. (Hint: your answer should be consistent with your answers to problems 11 and 12.)