Download - Foundations of Physical Science
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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