p3- electricity

• what does lepgen stand for ?

  loose electrons positive gain electrons negative
• what is the charge of an overall atom?

  neutral (0)
• what are the 2 properties of charges?

  opposite charges attract like charges repel
• label the charges of an atom?

  positive protons (+1)neutral neurons 0negative electrons (-1)
• which 2 elements on the atom have the same number ALWAYS in an atom

  protons and electrons
• what is the symbol for quantity, unit and symbol for unit for charge

  symbol for quantity- Q unit- coulombs symbol for unit- C
• what is the symbol for quantity, unit and symbol for unit for current

  symbol for quantity- Iunit- ampssymbol for unit- A
• what is the symbol for quantity, unit and symbol for unit for time

  symbol for quantity- tunit- seconds symbol for unit- s
• what is the symbol for quantity, unit and symbol for unit for voltage

  symbol for quantity- Vunit- voltssymbol for unit- V
• what is the symbol for quantity, unit and symbol for unit for resistance

  symbol for quantity- Runit- ohmssymbol for unit- Ω
• what is the charge of an electron


  1.6x10^-19 coulombs
• What is potential difference?

  the factor the pushes or pulls the charges around using energy
• more potential difference means...

  more current
• more resistance means ....


  less current
• whats the equation for current

  current= potential difference/ resistance
• what is the equation for potential difference


  Potential difference = current x resistance
• what do batteries provide

  potential difference
• job of a cell (battery)

  to give each charge some energy
• job of a wire

  to carry electrical current
• job of a ammeter

  to measure the flow of a current
• job of a voltmeter

  to measure the potential difference
• job of a light bulb

  to give light
• how many paths are there in a series circuit


  1
• how do you work out the resistance in a series circuit


  add them together
• how much energy in a parallel circuit is given in each branch

  the same amount
• how many paths does a parallel circuit have


  2
• in a parallel circuit more current flows down with less...

  resistance
• how do you work out the original current in a parallel circuit

  add the different branches value up