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Plumbing Principles

Exam revision materials for Plumbing Level 2&3 and ACS Gas Safety test

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Useful Information

Physics

Electrics

  • 1 Coulomb = 6.24•1018 electrons
  • Current (I) - amount of coulombs per second
  • Voltage is force = Joules per coulomb
  • 1R is 1 Ohm is 1 Ω
  • P=I•V; V=I•R
  • Alternating current and Direct Current
< Go Back2013-02-24

Energy

  • Latent heat – changes state without changing the state
  • Sensible heat – changes temperature without state
  • Specific heat capacity – 4.186 kJ/kg°C for water
  • Corrosion
    • Air and water
    • Effect of acids (6.5-8.0-ideal for central heating system)
    • Electrolytic action (anode, cathode, electrolyte)
  • DZR fittings are NOT effected by disinfection
  • Density=mass/volume
< Go Back2013-02-24