electricty

    Cards (62)

    • What must be true for electrical charge to flow?
      The circuit must be closed
    • What is required for charge to flow in a circuit?
      There must be a source of potential difference
    • What does electrical current represent?
      Flow of electrical charge
    • How does the rate of flow of charge relate to current?
      Greater flow rate means greater current
    • What is the formula relating charge, current, and time?
      Q=Q =It I \cdot t
    • What is true about current in a single closed loop?
      The current has the same value at any point
    • What factors affect the current through a component?
      Resistance and potential difference
    • How does resistance affect current for a given potential difference?
      Greater resistance results in smaller current
    • What is the formula for potential difference, current, and resistance?
      V=V =IR I \cdot R
    • What characterizes an ohmic conductor?
      Resistance is constant, current is proportional to potential difference
    • What happens to the resistance of a filament lamp as temperature increases?
      The resistance increases with temperature
    • How does a diode behave in terms of current flow?
      Current flows in one direction only
    • What happens to resistance as current increases in a resistor?
      Resistance increases, current decreases
    • How does temperature affect the resistance of a thermistor?
      Resistance is lower at higher temperatures
    • How does the length of a wire affect its resistance?
      Greater length results in more resistance
    • What is the behavior of an LDR in light conditions?
      Resistance decreases with greater light intensity
    • What happens to a diode's resistance in the reverse direction?
      It has a very high resistance
    • What characterizes a series circuit?
      Current follows a single path
    • What is true about current in a series circuit?
      The current is the same everywhere
    • How is total resistance calculated in a series circuit?
      Total resistance is the sum of resistances
    • What characterizes a parallel circuit?
      Current splits into multiple paths
    • What is true about potential difference in a parallel circuit?
      The potential difference is the same across each branch
    • How is total current calculated at a junction in a parallel circuit?
      Total current is the sum of currents in branches
    • What happens to total resistance when resistors are in parallel?
      Total resistance is less than the smallest resistor
    • How do electric fields behave around charges?
      They point away from positive charges, towards negative charges
    • What happens to the strength of an electric field with distance from the charge?
      Closer to the charge, the stronger the force felt
    • What type of electricity supply is mains electricity?
      AC supply
    • What is the frequency of domestic electricity supply in the UK?
      50 Hz
    • What is the voltage of the domestic electricity supply in the UK?
      About 230 V
    • How does AC current behave?
      It continuously varies from positive to negative
    • What is the difference between AC and DC?
      AC changes direction, DC flows one way
    • What color is the live wire in a plug?
      Brown
    • What is the voltage of the live wire?
      230 V
    • What is the purpose of the neutral wire?
      Completes the circuit
    • What is the function of the earth wire?
      Prevents appliances from becoming live
    • What happens if the live wire touches the metal casing?
      The casing becomes live, causing electric shock
    • What is power in terms of energy transfer?
      Energy transferred per second
    • How is power related to current and voltage?
      Power is directly proportional to current and voltage
    • What is the formula for energy transferred in terms of power?
      E=E =Pt P \cdot t
    • What is the formula for energy transferred in terms of charge?
      E=E =QV Q \cdot V
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