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Physics
Electricity
Current Electricity
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Alizon John Lantion
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Cards (33)
Current
It is the flow of electric charge in a conductor
A
circuit
is a complete circular path or loop where electricity flows through.
Conventional Current flow
It is the flow from positive terminal to negative terminal
Electron Flow
It is the actual direction in which electron flow in a circuit
Formula for Current
I=Q/t
One ampere
is equivalent to one coulomb per second
What is the standard unit for current
Ampere
Who is the father of electromagnetism?
Andre-Marie Ampere
Resistance (R)
It is the property of a material or component that opposes the flow of electrical current
Resistor
It is used to limit the flow of electrical current in a circuit
What are the factors that affecting the resistance of a conductor?
The nature of the material, The length of the material, The cross-sectional area of the material
Resistivity of common conductors
Silver
:
1.59
x 10-8 Ω m
Copper
:
1.68
x 10-8 Ω m
Gold
:
2.44
x 10-8 Ω m
Aluminum
:
2.65
x 10-8 Ω m
Conductivity
It is a physical property of a conductor that affects its ability to carry energy.
Resistivity
measures of the resistance of a given size of a specific material to electrical conduction.
The length of the material
the longer the conductor the greater its resistance
The cross-sectional area (A) of the material
The thicker the conductor the less its resistance
For conductors, increase in temperature means
increase
in resistance
Formula for resistance temperature
R2=R1[1+a(T2-T1)
]
What is (a) stands for?
Temperature coefficient
He was a German physicist and mathematician
Goerg Simon Ohm
Ohm's law
This law states that the current through a conductor between two points is directly proportional to the voltage across two points
Formula for Ohm's law
I= V/R
Ohmic
a material that follows ohms law
Non-ohmic
Does not follow ohms law
Electromotive force
It is the energy per unit charge supplied by a source of electron power. It is also represent the maximum potential difference.
Electrical Energy
It is the energy transferred of consumed by an electrical circuit or device over period of time
Power
It is the rate at which electrical energy transferred within a circuit per unit time
Formula for power
P= W/t
Voltameter
It is an instrument that measures the difference in electrical potential between two points
Ammeter
It is used to measure the electric current in a circuit
Two types of Voltameter
Digital and Analog
Analog Voltameter
It moves a pointer across a scale on proportion to the circuit's voltage
Digital Voltameter
It measures an unknown input voltage