LAB #2: Fun with DC Circuits - PhET

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voltage source -->wire -->resistor -->(A)(B)(C)(D)(E)The Tools:2
-DC Power Supplyvoltagecurrentmetal connectorvoltagecoarsefinecurrent+On your bench:The two instruments you will use in this lab are a DCpower supply and a digital multimeter. The DC powersupply produces a constant voltage, which can beadjusted anywhere from zero to 30 volts with the voltageknobs (coarse and fine) on the front panel. The powersupply has three output terminals: plus (red), minus(black), and ground (green). The ground terminal isalways at zero volts. In this experiment, the ground andminus terminals are tied together by a metal connectorso the minus terminal is also at zero volts. Both thecurrent and voltage produced by the power supply canbe read on meters on the front panel. Also on the frontpanel is a current-limit knob, which can be adjusted tolimit the maximum output current, to prevent damage tosensitive circuit elements. In this lab, the current knobhas been set and clamped in place so the power supplycannot produce more than about 0.6A current.The hand-held digital multimeter (DMM) is a wonderful little device which can be used tomeasure the voltage difference between any two points in a circuit, the current, and theresistance or capacitance of any circuit component(s). In this lab, we will use the DMM tomeasure both resistances and DC voltage differences. There are 2 wires attached to theDMM. One of the two wires always goes to the COM (common) terminal. To measureeither the voltage difference or the resistance, the second wire is attached to the “VΩ”input. In this lab, all our measurements will be DC, so the DC/AC switch (upper right)should always be in the DC position. The DMM has an alarm; it rings if you have wiresplugged into positions which conflict with the central knob’s position.The 2 wires attached to the DMM are called "needle probes". You can quickly measure thechange in voltage between any two points in a circuit by touching the points with theneedle probes.When measuring aresistance with a DMM,you must disconnect thesource of the resistancefrom any other devices,such as power supplies.Never try to measure theresistance of a resistorwhile it is still in a circuit.DCΩVDC ACVMeasuring a resistancewith the DMM.DMMYou will also be usingThe CircuitcomVΩneedle probes3
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LAB #2: Fun with DC Circuits - PhET

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