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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 Goal The 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: ammeter load cell 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: Power Voltage Current P VI 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? V 9.0V I 2.0 A P? Power: Example A 9-V battery is connected to a load that draws 2 A. What is the power consumed by the load? V 9.0V I 2.0 A P? P VI P (9.0V )( 2.0 A) 18W Power: Example A 9-V battery is connected to a load that draws 2 A. What is the power consumed by the load? V 9.0V I 2.0 A P? P VI P (9.0V )( 2.0 A) 18W 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.