Electric Current. There are 72 names of French mathematicians, engineers and scientists on the side of the Eiffel tower.

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Presentation transcript:

Electric Current

There are 72 names of French mathematicians, engineers and scientists on the side of the Eiffel tower

Electric Current (I) The flow of electric charge Unit- Amperes (Symbol A) An Ampere - 1 coulomb of charge second (1 coulomb = 6.24 billion billion electrons) Measured using an ammeter

Electric Current When no electricity is applied…free electrons (conducting electrons) are always moving in random motion But when the switch is closed the free electrons of the conductor are forced to drift toward the positive terminal under the influence of the electric fieldfree electronspositive

Resistance

Resistance- helps to control the amt of current Opposition to the passage of an electric current through that conductor.electric current Unit- ohm (Ω)ohmΩ

Resistance (R) The resistance of an object depends primarily on 3 factors: 1) What the material is made of Place in order of least resistance the following materials: Aluminum, gold, silver, glass, copper Silver Copper Gold Aluminum Glass

The resistance of an object depends primarily on 3 factors: 2) It’s thickness A thick copper wire has lower resistance than an otherwise-identical thin copper wire.

Not a good idea 3) It’s length For example- a long copper wire has higher resistance than a short copper wire.

Relationship between voltage, current and resistance

Ohm’s Law

Current = Voltage Resistance Current (amps)= Voltage (volts) Resistance (ohms) The greater the voltage the _ the current The greater the resistance the _ the current

Resistance A typical lightbulb has a resistance of 100 Ώ An iron or toaster has a resistance of Ώ The lower resistance permits a large current, which produces a considerable amount of heat