By Tony R. Kuphaldt
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Additional resources for Experiments
Because measuring current in this manner requires the meter be made part of the circuit, it is a more difficult type of measurement to make than either voltage or resistance. Some digital meters, like the unit shown in the illustration, have a separate jack to insert the red test lead plug when measuring current. Other meters, like most inexpensive analog meters, use the same jacks for measuring voltage, resistance, and current. Consult your owner’s manual on the particular model of meter you own for details on measuring current.
Connect the 330 Ω resistor to the 6 volt battery using a pair of jumper wires as shown in the illustration. Connect the jumper wires to the resistor terminals before connecting the other ends to the battery. This will ensure your fingers are not touching the resistor when battery power is applied. You might be wondering why I advise no bodily contact with the powered resistor. This is because it will become hot when powered by the battery. You will use the thermometer to measure the temperature of each resistor when powered.
Lamp Battery break in circuit + Battery - No light! Lamp Using your multimeter set to the appropriate ”DC volt” range, measure voltage across the battery, across the lamp, and across each jumper wire. Familiarize yourself with the normal voltages in a functioning circuit. Now, ”break” the circuit at one point and re-measure voltage between the same sets of points, additionally measuring voltage across the break like this: 30 CHAPTER 2. BASIC CONCEPTS AND TEST EQUIPMENT V A V A OFF A + Battery COM - No light!