Basic Ohm's Law & Series and Parallel Circuits

ENGINEERING lAB 1Variable resistor:1. Identify the end terminals and the wiper terminal for the potentiometer. Number them 1, 2and 3 with 2 being the wiper.2. Position the ohmmeter between terminals 1-2, 2-3 and 1-3 and record these measuredvalues in Table 1a-3.3. Add the values measured between terminals 1-2 and 2-3 and compare the result with thevalue measured between 1-3 (theoretical value).4. Reposition the shaft of the potentiometer and repeat steps 2 and 3 for the other two trials.Test (b). Voltage and Current MeasurementsAim:• To measure voltage and current in DC circuit.Apparatus:• DC voltage supply, 2k resistor, and two Digital Multimeters (2DMMs).Background:The test will familiarize you with the basic voltage and current measurements that is connectedto a dc power supply.Voltage Measurements• A voltemeter must always be connected with probes across the component under test;that is, the circuit need never be broken (see Figure 1b-1). This is often referred to asparallel connection.• Polarity : It is a good practice to place the correct leads at the proper nodes. Eg. Redlead at the positive node and the black lead at the negative node.Current Measurements• In measuring current (Figure 1b-2), the meter must always be inserted within the circuitin such a manner that the current to be measured will flow through the meter and itis similar to a series connection. You must break the circuit to perform a currentmeasurement.4