charge and current: more practice. a review of circuits: student learning goal the student will be...
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Charge and Current: More Practice
Charge and Current: More Practice
Charge and Current: More Practice
Charge and Current: More Practice
Charge and Current: More Practice
A Review of Circuits: Student Learning GoalThe student will be able to construct and then
compare and contrast the behaviour and functions of series and parallel DC circuits (D2.2, D3.1).
A Review of Circuits
SPH4C
Circuits
A circuit consists of at least one power source (such as a battery) and one load (such as a light bulb).
The two need to be connected in a complete, closed loop.
Circuit Symbols
We can represent circuits with schematic diagrams using the following symbols:
Circuit Symbols
We can represent circuits with schematic diagrams using the following symbols:
Single power cell
Circuit Symbols
We can represent circuits with schematic diagrams using the following symbols:
Single power cell
Multiple cells
Circuit Symbols
We can represent circuits with schematic diagrams using the following symbols:
Single power cell
Multiple cells
Connecting wire
Circuit Symbols
We can represent circuits with schematic diagrams using the following symbols:
Single power cell
Multiple cells
Connecting wire
Load/resistor
Circuit Symbols
We can represent circuits with schematic diagrams using the following symbols:
Single power cell
Multiple cells
Connecting wire
Load/resistor
Open switch
Closed switch
Circuit Symbols
We can represent circuits with schematic diagrams:
Circuit Symbols
We can represent circuits with schematic diagrams:
Ammeters
To measure the current (I) in an electrical circuit, an ammeter may be placed in the circuit:
cell
load ammeter
Voltmeters
The voltage across any part of a circuit may be measured by placing a voltmeter across it:
Power
The power (in Watts) delivered to a circuit or consumed by a load is:
VIP
CurrentVoltagePower
Power: Example
A 9-V battery is connected to a load that draws 2 A. What is the power consumed by the load?
Power: Example
A 9-V battery is connected to a load that draws 2 A. What is the power consumed by the load?
?
0.2
0.9
P
AI
VV
Power: Example
A 9-V battery is connected to a load that draws 2 A. What is the power consumed by the load?
?
0.2
0.9
P
AI
VV
Power: Example
A 9-V battery is connected to a load that draws 2 A. What is the power consumed by the load?
?
0.2
0.9
P
AI
VV
WAVP
VIP
18)0.2)(0.9(
A Caution
Remember never to make a circuit connecting one terminal of the battery to the other without something to consume the power (such as a light bulb) in between.
This would be a short circuit.