foundations of physical science
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Foundations of Physical Science. Workshop: Electric Circuits. Electric Circuits. CPO Science. What “flow of understanding” provides the necessary foundation for an understanding of electricity? What kinds of electric circuits can you build? How does electricity behave?. Key Questions. - PowerPoint PPT PresentationTRANSCRIPT
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Foundations of Physical ScienceWorkshop: Electric Circuits
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Electric CircuitsCPO Science
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Key QuestionsWhat “flow of understanding” provides the necessary foundation for an understanding of electricity?
What kinds of electric circuits can you build?
How does electricity behave?
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Light the Bulb!
What needs to happen to get the bulb
to light?
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Parts of our Circuits Kit Wooden Board
Wires of various lengths
On/Off switches
Bulbs and holder
Resistors – fixed and variable
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Build a simple Circuit Place the bulb in a socket
Use one D cell
Make the bulb light!
Add a switch to conserve D cell energy
Use your finger to trace the path of electricity from one terminal of the D cell to the other terminal
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Parts of a Circuit
Wire
Bulb
Battery
Switch
Symbols used for Diagramming
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Let’s build on this… Add a second D cell to your circuit,
right next to the first. Be sure to match up positive terminal with negative terminal
Do you notice any difference?
Add a second light bulb to the circuit, keeping only one pathway for electricity to follow
What do you observe now?
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Series Circuit
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Another way to light two bulbs
Keep two D cells in the circuit
Wire up the 2 light bulbs so that there are two branches or pathways for electricity to follow
What differences do you observe?
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Parallel Circuit
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Can you explain why the bulbs in a parallel circuit
are brighter?
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Water Analogy
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Resistance and CurrentInverse Relationship
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Voltage
The amount of potential energy that each unit of charge has
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ReviewV = voltage, measured in volts
I = current, measured in amperes, or amp
R = resistance, measured in Ohms, symbol
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Using the Multimeter to measure Voltage
Battery by itself Battery in a circuit
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Using the Multimeter to measure Current
Multimeter completes the circuit
Current in a circuit
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Analyze Circuits1 bulb 2 bulbs in
series 2 bulbs in parallel
Total voltage available
Voltage across each bulb
Total current at terminal
Current through each bulb
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Why are parallel bulbs brighter?1 bulb 2 bulbs in
series 2 bulbs in parallel
Total voltage available
2.8 V 2.8 V 2.8 V
Voltage across each bulb
2.8 V 1.4 V 2.8 V
Total current at terminal
.12 A .10 A 0.24 A
Current through each bulb
.12 A .10 A 0.12 A