Current Electricity

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