Electricity

• What is the definition of Alternating Potential Difference?

  A continually oscillating current flow
• What is the unit of current?

  Amperes (Amps)
• What does attraction refer to in terms of electric charges?

  A force pulling opposite charges together
• What is the unit of charge?

  Coulomb
• What is the function of a diode?

  Allows current to flow in one direction
• What is Direct Potential Difference?

  A one-directional current flow
• What is the purpose of the Earth Wire?

  Prevents an appliance from becoming live
• What do Electric Field Lines represent?

  Direction of force on a positive charge
• What is an Electric Field?

  A region where a charge experiences force
• What is Electrical Current?

  The rate of flow of electrical charge
• What is Electrical Work?

  Work done when charge flows in a circuit
• What is a Filament Lamp?

  A light emitting component with a filament
• What is Insulation in electrical terms?

  Coating that prevents electrocution
• What is a Light Dependent Resistor (LDR)?

  A light sensitive component
• What does the Live Wire do?

  Carries alternating current from the supply
• What is Mains Electricity?

  An a.c supply with 50Hz and 230V
• What is the function of the Neutral Wire?

  Completes the circuit in a mains supply
• What is a Non-Contact Force?

  A force between separated objects
• What is an Ohmic Conductor?

  A conductor with current proportional to voltage
• What is the unit of resistance?

  Ohms
• What does it mean for components to be in Parallel?

  Same potential difference across each component
• What is Potential Difference?

  Product of resistance and current flow
• What causes Repulsion in electric charges?

  Like-charges brought near each other
• What is Resistance?

  Opposition to current flow
• What is the total resistance of resistors in Parallel?

  Inverse of the sum of inverses
• What is the total resistance of resistors in Series?

  Sum of the resistances of individual components
• What must be true for electrical charge to flow?

  Circuit must be closed and have potential difference
• What is electrical current?

  Current is the flow of electrical charge
• What does it mean for components to be in Series?

  Same current passing through each component
• What is Static Charge?

  Imbalance of positive and negative charges
• How does the rate of flow of charge affect current?

  Greater flow rate results in greater current
• What is the formula for charge flow?

  $Q =$$I \cdot t$
• What do Step-Down Transformers do?

  Lower potential difference to safe levels
• What happens to current in a single closed loop?

  Current has the same value at any point
• What do Step-Up Transformers do?

  Increase potential difference generated by power stations
• What factors affect the current through a component?

  Resistance and potential difference affect current
• What is The National Grid?

  Network of power stations and cables
• How does resistance affect current for a given potential difference?

  Greater resistance results in smaller current
• What is a Thermistor?

  A temperature dependent component
• What is the unit of potential difference?

  Volt