Electricity

• Draw the symbol for a cell

  
• Draw the symbol for a battery

  
• What is the difference between a battery and a cell?

  A Battery is composed of more than one cell
• Draw the symbol for an ammeter

  
• How must an ammeter be placed in a circuit?

  in series
• Draw the symbol for a voltmeter

  
• How must a voltmeter be placed in a circuit?

  in parallel to the component
• Draw the symbol for a lamp

  
• Draw the symbol for a diode

  
• Draw the symbol for a resistor

  
• Draw the symbol for a LED (light emitting diodes)

  
• Draw the symbol for a variable resistor

  
• Draw the symbol for a LDR (light dependent resistor)

  
• Draw the symbol for a fuse

  
• Draw the symbol for a thermistor

  
• Draw the symbol for an open switch

  
• Draw the symbol for a closed switch

  
• What is difference between series and parallel circuits?

  series has one pathway for the current whereas a parallel circuit the current can split
• Define current

  Flow of negatively charged carriers (electrons)
• What is equation linking charge, current and time?

  charge = current x time
• What are the units for charge?

  coulomb
• What are the units for current?

  Amps
• What are the units for time?

  seconds
• Define potential difference

  the work done when a coulomb of charge passes between two points
• What is equation linking potential difference, current and resistance?

  V = IR
• What are the units of potential difference?

  Volts
• What are the units for resistance?

  ohms
• Draw the current-potential different graphs for a conductor

  
• Draw the current-potential different graphs for lamp

  
• Draw the current-potential different graphs for a diode

  
• How does resistance of a thermistor change as temperature changes?

  An increase in temperature decreases the resistance
• How does resistance of an LDR change as light intensity changes?

  An increase in light intensity decreases the resistance
• How does current behave in a series circuit?

  there is the same current through each component
• How does potential difference behave in a parallel circuit?

  the potential difference across each component is the same
• How does resistance behave in a parallel circuit?

  "the total resistance of two resistors is less than the resistance of the smallest individual resistor."
• What is the voltage of mains electricity in the UK?

  230V
• What is the frequency of mains electricity in the UK?

  50Hz
• What are the three wires inside a plug?

  Live (brown), Neutral (blue) and Earth (green and yellow stripes)
• What are the safety features on a plug?

  Earth wire, fuse
• What is equation linking power, current and potential difference?

  power = potential difference x current