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2. How powerful is it?
2. How powerful is it?
Connect a circuit to measure voltage and current, and calculate resistance.
Identify the sources of error in taking measurements of current and voltage.
Draw a line of best fit from collected data.
Extrapolate and interpolate from a graph.
Recall and use Ohm’s Law: V = IR
Recall and use the formula for Power: P = I x V
MONDAY P4 L2
MONDAY P4 L2
Practical 2.1 Current, Voltage and Resistance
Practical 2.1 Current, Voltage and Resistance
View video: Setting up Ohm's Law https://www.youtube.com/watch?v=Vh3XGz7hgU4 [4.35]
NOTE: Adjust the metal bar at the top of the rheostat until you ammeter has a reading of between 3.5 – 4 Amps.
Once you have adjusted the rheostat to this position, DO NOT CHANGE THE POSITION OF THE METAL BAR.
9E 11 Ohm's Law Prac RC.docx9E 11 Ohm's Law Graph on Excel.pdfHow to add a trendline (lobf) in Excel
How to add a trendline (lobf) in Excel
In Excel 2019, Excel 2016 and Excel 2013:
Click anywhere in the chart to select it.
On the right side of the chart, click the Chart Elements button (the cross button), and then do one of the following:
Check the Trendline box to insert the default linear trendline:
Click the arrow next to the Trendline box and choose one of the suggested types:
Click the arrow next to Trendline, and then click More Options. This will open the Format Trendline pane, where you switch to the Trendline Options tab to see all the trend line types available in Excel and choose the one you want. The default Linear trendline will be pre-selected automatically. Optionally, you can also display the trendline equation in the chart.
Another quick way to add trendline to an Excel chart is to right-click the data series and then click Add Trendline….
Think about the following sources of error:
Can the wire be exactly the same width all the way along?
How easy was it to read the pointers of the ammeter and voltmeter.
Can heating the wire (current flowing through for a longer time) make a difference? (Heating the metal conductor causes atoms to vibrate more, which in turn makes it more difficult for the electrons to flow, increasing resistance.)
TUESDAY P6 STEAM
TUESDAY P6 STEAM
Completion of Practical 2.1
Completion of Practical 2.1
Think about the following sources of error:
Can the wire be exactly the same width all the way along?
How easy was it to read the pointers of the ammeter and voltmeter.
Can heating the wire (current flowing through for a longer time) make a difference? (Heating the metal conductor causes atoms to vibrate more, which in turn makes it more difficult for the electrons to flow, increasing resistance.)
Review Electricity
Review Electricity
How electrons move in a conductor.
The Conduction Continuum
View videos:
What is Voltage https://www.youtube.com/watch?v=z8qfhFXjsrw [6.56]
What is Electric Current? https://www.youtube.com/watch?v=kYwNj9uauJ4 [5.12]
Resistance
Resistance
Consider the two water tanks, one with a narrow pipe and one with a wide pipe.
We can't fit as much volume through a narrow pipe as a wider one at the same pressure. This is resistance. The narrow pipe "resists" the flow of water through it even though the water is at the same pressure as the tank with the wider pipe.
In electrical terms, this is represented by two circuits with equal voltages and different resistances. The circuit with the higher resistance will allow less charge to flow, meaning the circuit with higher resistance has less current flowing through it.
Ohm's Law
Ohm's Law
Georg Ohm defined the unit of resistance of "1 Ohm" as the resistance between two points in a conductor where the application of 1 volt will have pressure to push 1 ampere of current. This value is usually represented with the greek letter "Ω", which is called omega, and pronounced "ohm" in these calculations.
TASK 2.1
TASK 2.1
Investigate https://phet.colorado.edu/en/simulation/ohms-law (below) using the worksheet at right.
9 WDIW 5.3 Ohms Law Phet Lab1.pdfTHURSDAY P5 of double L3
THURSDAY P5 of double L3
TASK 2.2
TASK 2.2
Complete Practice Problems
9E 11 Ohms Law Triangle with Qs.docxTASK 2.5
TASK 2.5
Read and make any notes you feel you need from https://www.allaboutcircuits.com/textbook/direct-current/chpt-2/voltage-current-resistance-relate/
THURSDAY P6 of double L3
THURSDAY P6 of double L3
Practical 2.2 Kettle Power
Risk Assess https://www.riskassess.com.au/risk_assessment/8684225?previous_url=%2Fscheduling%3Fdate_selection%3DFour%2BWeeks Practical 2.2 Kettle Power
9E 12 Kettle Power Prac.docxTASK 2.4 POWER
TASK 2.4 POWER
Complete Power Calculation Worksheets
9E 12 Power WS.pdf9E 12 Using Electricity costs.docxPage updated
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