Ohm's Law Experiment: Measuring Voltage and Current with Voltmeter and Ammeter, Summaries of Law

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Ohm’s LawExperiment

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− Resistance Wire

PowerSupply

-^ For this experiment^ – Current controls need to be turned completelycounterclockwise -- we will later adjust the current to 1A.^ – Voltage controls completely clockwise Notice that there is acoarse and fine adjustment for both current and voltage. •^ When the green power button is pushed in, the power supply ison. When it is out, the power is off. •^ You will use the + and

−^ terminals to complete the circuit just like you would for a battery.

Ammeter

-^ The black terminal is thenegative or common terminal.•^ The red terminals are thepositive. There are threescales on the meter in thepicture. Always start with thecoarsest scale, in this case 5A.If the reading is less than 0.5Aor 0.05A, then you shouldchange to the appropriate finerscale. You do not want to beusing the 0.5 scale to measure3A! This will damage themeter.

-^ To connect the circuit,first put the items inthe circuit on the tablein a position similar tothat in the diagram.This is not necessarybut it makes it easier.

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− Resistance Wire

The blue wire isconnecting thepoint A, the end ofthe resistance wireto the voltmeter.One banana plugcan attach to theother banana plugat point A.

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− Resistance Wire

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The yellow wire isconnecting negative terminalof the voltmeter to the slidingswitch. To make thisconnection, a banana plugwas plugged into thevoltmeter; an alligator patchcord was attached to the atthe other end of the bananaparch cord. The other endof the alligator cord goes tothe sliding switch. A

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− Resistance Wire

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− Resistance Wire

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A blue wire was then connected from the switch to the negativeterminal of the power supply. This completed the circuit.

Yes. When the switch isconnected in this manner itwill complete the circuit.

No. This will not work. Why?