energy/electricty p1&2

    Cards (22)

    • Energy
      Can't be created or destroyed, only transferred from one store to another
    • Forms of energy
      • Gravitational Potential Energy
      • Elastic Potential Energy
      • Nuclear
      • Thermal
      • Electrostatic
      • Chemical
      • Kinetic
    • Specific heat capacity
      Energy required to raise the temperature of 1kg of a substance by 1°C
    • Power
      The rate of energy transfer
    • Efficiency
      The amount of energy going into a system usefully
    • Energy sources
      • Finite (non-renewable) - Fossil fuels, Nuclear fuel
      • Non-finite (renewable) - Wind, Solar, Biofuels
    • Fossil fuels

      • Burned to produce heat
      • Non-renewable
    • Nuclear fuel
      • Fused in nuclear reactors to produce heat
      • Non-renewable
    • Wind power
      • Wind used to turn turbines
    • Solar power
      • Light from sun produces electricity
    • Biofuels
      • Plant matter burned to produce heat
      • Renewable
    • Electricity
      Flow of charged particles, which can be electrons or protons
    • Current
      Flow of charged particles (electrons)
    • Potential difference
      How much energy is being transferred, measured with a voltmeter
    • Resistance
      Measure of how much an object resists flow of current
    • Fixed resistor
      • Resistance does not change
    • Filament lamp
      • Resistance increases as temperature increases
    • Diode
      • Allows current to flow in one direction only
    • Thermistor
      • Resistance decreases as temperature increases
    • LDR
      • Resistance decreases as light intensity increases
    • National Grid
      1. Power station produces high voltage
      2. Step-up transformer increases voltage, decreases current
      3. Cables distribute electricity
      4. Step-down transformer decreases voltage, increases current
      5. Homes receive safe voltage
    • The National Grid distributes energy to where it's needed