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Laboratory Exercise Basic Electrical Calculations

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Team Members: ______________________________

______________________________

ENGR 199 – Introduction to Engineering Principles and Practices I – Fall 2009

Laboratory Exercise

Basic Electrical Calculations and Measurements

Students successfully completing this lab exercise will accomplish the following

Objective:

objectives:

1. Gain familiarity reading resistor color codes.

2. Learn how to construct simple resistive circuits.

3. Gain familiarity with basic electrical calculations.

4. Learn how to measure resistance, voltage and current using a Digital

Multimeter (DMM)

Digital Multimeter, various fixed resistors, breadboard, power supply

Equipment:

Procedure:

Resistance Identification and Measurement

Obtain three resistors and sort them as R1, R2, and R3. Using the table of resistor color

codes shown at the end of this document, determine the nominal resistance of each

resistor from its color bands. Measure the actual resistance using the DMM as an

ohmmeter.

Using the formula below, calculate the percent error between the measured value and the

nominal value of each resistor. From the percent error calculation, determine whether or

not the resistor is within tolerance. Record all resistor information in table 1.

100 %

Table 1: Resistor identification and measurements

Within

Color Code

Measured

Color Code

% error

Tolerance?

Resistance

Tolerance

Resistance

(Y or N)

Circuit Assembly and Measurement

Construct the voltage divider circuit shown in the schematic diagram of Figure 1 below.

Measure the source voltage (V

) to be approximately 10 V before applying it to the circuit.

Record your measured source voltage.

(measured) = _______________

Laboratory Exercise Basic Electrical Calculations