Introduction to Electrical & Electronic Devices

In this exercise, you will:

1. ..learn to use digital and analog multimeters to measure voltage, current, resistance, capacitance.
2. ..connect several resistors together in series and parallel to create equivalent resistors of another resistance.
3. ..use the high voltage power source to produce current with a required amount of voltage.

Record your measurements either in the tables or on the back of these sheets.

MEASUREMENTS & CALCULATIONS:

1. Measure the AC voltage generated by the digital function generator using the digital multimeter. Set the function generator on the first setting (sine wave), and the multimeter on AC voltage. The measurement range should be set on 20 V since you will create an AC voltage of 2V, and the probe wires should be plugged into the COM (black) and VΩ (red) sockets. Start out with the amplitude knob of the function generator turned all the way to the left (0V). The voltage can be measured by touching the meter's probes to the metallic inner part of the red and black sockets on the function generator. The frequency of the AC from the generator will not strongly affect the voltage. Set it to 900 Hz. Then adjust the amplitude so that the voltage reads about 2V on the meter. Record the measurement.
2. Without changing the settings on the function generator, measure the same thing using the analog multimeter. The left knob should be set on "AC volts only," and the range should be set on 2.5V. The probe wires should be plugged into the COMMON (black) and + (red) sockets. Record the measurement.
3. Use the digital meter to measure the resistance across the lengths of copper and copper-nickel wire on the coils. Measure all the resistances in the table.
Type WireGaugeLength (m)Resistance (Ω)Calculated% Diff
Copper22 (.644 mm diam.)10
Copper28 (.321 mm diam.)10
Copper22 (.644 mm diam.)20
Copper28 (.321 mm diam.)20
Copper-Nickel22 (.644 mm diam.)10
All wires in series------70
After measuring these, calculate for the first four, what each resistance should be according to:
The resistivity of copper is 1.7 × 10-8 Ω m. Remember that A is the cross-sectional area of the wire. The area of a circle is πr² (and r should be in meters).
4. Calculate the percent difference between the measured and calculated resistances.
5. Use the digital meter to measure the resistance of one each of the following resistors: 15Ω, 100Ω, 470Ω, 1000Ω. The range of the meter should be set appropriately, depending upon the resistance being measured.
6. Now put two of the resistors (any two of different resistance) in parallel and measure the resistance across them.
7. Given the resistance that you measured for each of the two resistors individually, compute what the resistance of the two resistors should be when they're in parallel.
8. Find the percent difference between the measured and computed values.
9. Use the digital meter to measure the capacitance of the 4 capacitors. Refer to the instructions for the meter to find out how to do this.
10. Measure the capacitance of any two of the capacitors in series.
CapacitorCapacitanceCalculated% Diff
1
2
3
4
combo
11. Calculate the theoretical capacitance of the combination.
12. Find the percent difference between the measured and calculated values.