Download 6.2 Electric Current Name: Current and Voltage Difference Electric

6.2 Electric Current
Name: ________________________
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Current and Voltage Difference
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Electric Current-The ___________________________ of electric charge in a __________ direction.
o Measured in ___________________
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One Ampere is equal to 1 coulomb per second
If there is no current, there is ________________ movement
o Movement forward=movement backward=movement side-to-side
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When an electric current is applied, there is still backward and forward movement, but the
electrons _____________________________________________
o Net movement
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Related to the force that causes electric charges to flow.
o From area of _________ voltage to ___________ voltage
o Measured in _______________
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Electric Circuits
o A ____________________ that electric current follows
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Battery, wire, lightbulb
Current and electron flow
o For historical reasons, we think of current as flow of _______________
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Positive charges DO NOT FLOW!!!!!!
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Due to this, current is in the _____________ direction of electron flow
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Electrons flow from ________ to ____________ voltage
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Current is from _____________ to ______________ voltage
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Batteries
o 2 main yypes:
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_______________ Batteries
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Carbon Rod (____________)
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Zinc Container (_______________)
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Moist paste (________________________)
o Allows electrons to flow
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Batteries in flashlights
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Metals can be different
o Lithium, carbon, and lithium solution
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Cell phone battery
Wet-cell Battery
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2 connected plates made of different metals in an electrolyte
o Unlike the paste in dry-cells, the wet-cell has a_______________
o Has _________________ connected together.
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Most common type is _____________________
o Lead and Lead dioxide in sulfuric acid solution
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Electrical Outlets
o The 2 holes of an outlet have a voltage difference
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In the U.S. usually __________________
Resistance
o Tendency of object to ____________________________
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Takes some of the flowing electrons from the current
o Measured in ___________________
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This symbol is the capital form of the Greek letter “Omega”
o This is why batteries charging get warm
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The resistor is taking some of the electrons, and converts the _____________ energy
to __________________ energy
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Ohm’s Law
o Current(A)=Voltage difference(V)/resistance(Ω)
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Current is measured in _____________________
o _______________________
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Where I is ______________
Example Problem
o The voltage difference in a graphing calculator is 6V, and the resistance is 1,200 Ω. What is
the current through the batteries of the graphing calculator?
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Equations
o Solve for V
o Solve for R
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Guided Practice
o An object has a resistance of 60 Ω as a current of 2 A goes through it. What is the voltage
difference across the object?
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You Try It!
o The voltage in a device is 50 V, and the resistance is 5 Ω. What is the current in the device?
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Types of Current
o ____________________ Current (___________)
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Type found in household electrical outlets
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________________________________________
o ________________________ Current (___________)
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Found in battery-powered devices
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Does not change direction
o Converters change types (ACDC)