Current Electric current Electric current is the rate of electron flow past a specific point in the circuit how fast electrons pass through a point in the wire The symbol for electric current is ID: 208015
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Slide1
Electric CurrentSlide2
Electric currentElectric current
is the rate of electron flow past a specific point in the circuit (how fast electrons pass through a point in the wire).
The symbol for electric current is
I
.
The units of electric current is
amperes
or
amps
(A).Slide3
Electric current
DCSlide4
Electric current
ACSlide5
Electric current can be compared to the flow of water.Slide6
Electric current can be compared to water current:
Comparison
Water CurrentElectric Current
Conductor
What
is flowing
Units for
flowing particles
Time interval
Rate of flow (current)
pipe or hose
wire
water molecules
electrons
Litres (L) of water
Coulombs (C) of charge
(1 C = amount of charge on 6.25x10
18
electrons)
per second (s)
per second (s)
litres per second
coulombs per second
1 ampere (A) = 1C/sSlide7
How Electricity WorksSlide8
AMMETERS are used to measure
the ________________
in a circuit.
electric current
How to use an AMMETERSlide9
How to use an AMMETER
I
1
I
0
I
0
the current coming from the power source.
I
1
the current passing through the bulb.
Example: We want to measure the current at I
0
and I
1
for the circuit below.
I
1Slide10
To measure the
current
at I
0
or I
1
, the circuit must be _________________ to make the
ammeter
part of the circuit. The ammeter is then connected in _____________.
disconnected
How to use an AMMETER
seriesSlide11
Connect the
terminal of the ammeter to the wire(s) leading to the ___________________terminal of the power source.
positive / red
How to use an AMMETER
positive / redSlide12
Connect the
terminal of the ammeter to the wire(s) leading to the ___________________terminal of the power source.
negative / black
How to use an AMMETER
negative / blackSlide13
How to use an AMMETER
I
1
To measure I
0
:Slide14
How to use an AMMETER
I
1
To measure I
1
:Slide15
How to Read an AMMETERSlide16
How to Read an AMMETER
What is the reading on this ammeter?
If you connected the circuit to the 3A setting on the ammeter, then the current reading is 1.5 A
.
If you connected the circuit to the 1A setting on the ammeter, then the current reading is
0.5 A
.Slide17
How to Read an AMMETER
What is the reading on this ammeter?
If you connected the circuit to the 3A setting on the ammeter, then the current reading is 2.15 A
.
If you connected the circuit to the 1A setting on the ammeter, then the current reading is
0.72 A
.Slide18
How to Read an AMMETER
What is the reading on this ammeter?
If you connected the circuit to the 300 mA setting on the ammeter, then the current reading is
215
mA
.Slide19
Electric Shock