Electricity and Circuits

    Cards (32)

    • What is potential difference?
      The work done in moving one coulomb of charge
    • What is current?
      A flow of electrons
    • What is charge?
      The rate of flow of electrons
    • What is resistance?
      The opposing of a current
    • What is power?
      Energy transferred in a certain amount of time
    • What does 'series' mean in a circuit?
      All components follow directly from each other
    • What does 'parallel' mean in a circuit?
      The current has alternate pathways
    • What are free (or delocalised) electrons?
      Electrons free to move through the conductor
    • What is the equation for charge?
      Q = It
    • What is the equation for potential difference?
      V = IR
    • How do you calculate total resistance in a series circuit?
      Total resistance = R1 + R2
    • What is the equation for power?
      P = VI
    • What is another equation for power?
      P = I x I x R
    • What is the equation for energy transferred?
      E = Pt
    • What is another equation for energy transferred?
      E = QV
    • What is the unit for current?
      Amps (A)
    • What is the unit for potential difference?
      Volts (V)
    • What is the unit for charge?
      Coulombs (C)
    • What is the unit for resistance?
      Ohms (Ω)
    • What is the unit for power?
      Watts (W)
    • What is the unit for energy transferred?
      Joules (J)
    • How do electric fields behave between like charges?
      Field lines move from the electric field
    • How do electric fields behave between unlike charges?
      Field lines move to the electric field
    • What is static electricity?
      A build-up of charge between two objects
    • What happens if there is enough static electricity?
      A spark will jump as a discharge
    • Do objects need to touch for a spark to occur?
      No, they do not need to touch
    • What is the National Grid?
      A system of overhead or underground cables
    • Why does the National Grid use high voltage?
      To make energy travel far easily
    • How does high voltage affect the National Grid's efficiency?
      It makes the National Grid more efficient
    • What are the key equations related to electricity?
      • Q = It (charge = current x time)
      • V = IR (potential difference = current x resistance)
      • Total resistance = R1 + R2
      • P = VI (power = potential difference x current)
      • P = I x I x R (power = current squared x resistance)
      • E = Pt (energy transferred = power x time)
      • E = QV (energy transferred = charge flow x potential difference)
    • What are the key units in electricity?
      • Current: Amps (A)
      • Potential difference: Volts (V)
      • Charge: Coulombs (C)
      • Resistance: Ohms (Ω)
      • Power: Watts (W)
      • Energy transferred: Joules (J)
    • What are the differences between series and parallel circuits?
      • Series: All components follow directly from each other
      • Parallel: Current has alternate pathways
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