Transcript Electrical Charge

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.