Electricity

• What is the circuit symbol for an

  ammeter?Ammeter

  
• What is the circuit symbol for a

  battery?Battery

  
• What is the circuit symbol for a

  cell?Cell

  
• What is the circuit symbol for a

  diode?Diode

  
• What is the circuit symbol for a

  fuse?Fuse

  
• What is the circuit symbol for a

  lamp (bulb)?Lamp (Bulb)

  
• What is the circuit symbol for an

  LDR?LDR

  
• What does LDR stand for?

  LightDependentResistor

  
• What is the circuit symbol for an

  LED?LED

  
• What is the circuit symbol for a

  resistor?Resistor

  
• What is the circuit symbol for a

  closed switch?Switch (closed)

  
• What is the circuit symbol for an

  open switch?Switch (open)

  
• What is the circuit symbol for a

  thermistor?Thermistor

  
• What is the circuit symbol for a

  variable resistor?Variable Resistor

  
• What is the circuit symbol for a

  voltmeter?Voltmeter

  
• For electrical charge to flow through a closed circuit the circuit must include a source of _________ __________

  Potential Difference
• Electric current is a

  flowof electrical ______Charge
• The size of an electric _______ is the rate of flow of electrical charge

  current
• Charge flow, current and time are linked by the equation

  charge flow = current x time

  
• Unit of charge flow, Q

  coulombs, C
• Unit of current, I

  amps, A
• Unit of time, t

  seconds, s
• Current has the same value at any point in a ______ circuit

  series

  
• The current (I) through a component depends on both the __________ of the component and the potential difference (V) across the component

  Resistance (R)

  
• For a given potential difference (voltage), the greater the resistance of the component the smaller the _______

  current

  
• Current, potential difference or resistance can be calculated using the equation

  potential difference = current x resistance

  
• Unit of potential difference, V

  volts, V
• Unit of resistance, R

  ohms, Ω
• The current through an ohmic conductor (at

  constant temperature) is ________ ____________ to the potential difference across the resistor.directly proportional

  
• The resistance of components such as lamps, diodes, thermistors and LDRs is not constant; it changes with the _______ through the component

  current
• The resistance of a filament lamp increases as the ___________ of the filament increases

  temperature

  
• The current through a diode flows in ___ _________ only

  one direction

  
• The _____ has a very high resistance in the reverse direction

  diode

  
• The resistance of a __________

  decreasesas the temperatureincreasesthermistor
• The resistance of an LDR

  decreasesas _____ _________increaseslight intensity
• An ___ can be used to switch lights on when it gets dark

  LDR
• A __________ can be used to switch heaters on when it gets cold

  thermistor
• There are two ways of joining electrical components, in series and in ________

  parallel

  
• For components connected in


  seriesthere is the same _______ through each componentcurrent

  
• For components connected in


  seriesthe total potential difference of the power supply is ______ between the componentsshared