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An electric current is a stream of charged particles, such as electrons or ions, moving through an electrical conductor or space. It is measured as the net rate of flow of electric charge through a surface or into a control volume.: 2 : 622  The moving particles are called charge carriers, which may be one of several types of particles, depending on the conductor. In electric circuits the charge carriers are often electrons moving through a wire. In semiconductors they can be electrons or holes. In an electrolyte the charge carriers are ions, while in plasma, an ionized gas, they are ions and electrons.The SI unit of electric current is the ampere, or amp, which is the flow of electric charge across a surface at the rate of one coulomb per second. The ampere (symbol: A) is an SI base unit: 15  Electric current is measured using a device called an ammeter.: 788 Electric currents create magnetic fields, which are used in motors, generators, inductors, and transformers. In ordinary conductors, they cause Joule heating, which creates light in incandescent light bulbs. Time-varying currents emit electromagnetic waves, which are used in telecommunications to broadcast information.

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  1. FeePee

    Bent my TRV pin. It's not currently leaking, but could it come loose?

    Good morning! I've had no heat in my attic bedroom for over 2 years - the rest of the radiators worked fine, but this one was a dead duck. I watched some YouTube videos, and read through these forums, and decided to have a look at the TRV pin. Lo and behold it was stuck down! I managed to...
    • FeePee
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    • america could currently leaking loose trv usa
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    • Forum: USA
  2. R

    Currently training as a gas engineer at Clyde College

    Hi everyone! My name is Robert. I'm currently training at Clyde College in Domestic Gas Foundation. I'm a time served plumber, and have completed IGAS training in the past. I'm sure I'll be asking lots of questions int he run up to my ACS exams and beyond! Thanks in advance
    • RobD
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    • college currently engineer gas gas engineer training
    • Replies: 0
    • Forum: Gas Engineers Forum
  3. C

    Currently awaiting repair Combi Boiler leaking for 8 years. Is my plumber incompetent?

    Hi everyone, my combi boiler has been leaking for 8 years. It is a german Vaillant VCW 204 https://www.google.com/search?client=firefox-b-m&biw=1280&bih=672&tbm=isch&sa=1&q=vaillant+vcw+204&oq=vaillant+vcw+204&aqs=mobile-gws-lite..0l5#imgrc=b27-0Ajev_snmM%3A The thing is, this device is from...
    • ColdAle
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    • america boiler combi combi boiler currently leaking plumber repair usa years
    • Replies: 11
    • Forum: USA
  4. N

    How to connect honeywell t5+ to viesmann vitodens 100 boiler.

    I have viessmann vitodens wb1b 100 boiler and im trying to install a honeywell t5+ wifi thermostat. I currently have a 2 wire thermostat with no c-wire. Can anyone help me with directions and or pictures?
    • Nstivefree
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    • america boiler connect currently honeywell install thermostat trying usa viessmann vitodens
    • Replies: 0
    • Forum: USA
  5. M

    New member currently training for my ACS!

    Hi all! New to all this and currently training to do my ACS for a change of career! (Had to grow up and stop playing with motorbikes) I found this website while looking for information to write up some method statements but while I'm here, if there are any Gas Safe engineers in or around north...
  6. N

    Has any one completed or are currently doing there cma1 training as I am looking to do this asap?

    Hi has anyone completed or currently doing there cma1 gas training? I live down in Bournemouth and am looking at getting my cma1 training done. Any advice would be great?
  7. D

    Looking for information on alternative manufacturers, currently install mostly Worcester

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  8. B

    Wanted: Plumber to lay UPONOR MLCP in 1 room

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  9. B

    Looking for employment - currently doing Level 3 NVQ and gas

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  10. D

    Teeing of 10mm feed(!) currently supplying plinth heater

    I'm doing a garage conversion and need a new radiator in the new room. The most accessible/convenient pipes I have found are 10mm feeding a space saving plinth heater. I know that the best solution is to tee off the main feed from the boiler as running 2 rads from a 10mm supply could give...
  11. G

    Looking for a gas engineer in South Devon who would be willing to help with Portfolio

    Hi Im looking for a gas engineer in South Devon/Dartmoor area who would be willing to let me shadow them on jobs and learn from them, Im currently completing my gas foundation course and have a solid background in plumbing and maintainence. I had a mentor but he has recently moved into teaching...
    • gazza77
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    • currently engineer gas gas engineer help looking plumbing portfolio south willing
    • Replies: 0
    • Forum: Plumbing Jobs | The Job-board
  12. U

    stopcock issues

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  13. J

    Level 3 Apprentice Looking to get back into domestic

    Does anybody know any firms that are taking on apprentices around Stockport/Manchester region. I'm Level 2 qualified and currently half way through my level 3. I have around 14 months remaining. Currently working in commercial properties but trying to get back into domestic so I can get my gas...
  14. C

    Valiant 831 Boiler - Wiring of thermostats and motorised valves?!

    Sorry in advance for the long thread! Just want to make sure i provided as much detail as possible. We are currently building an extension and whilst devastating the house have decided to install a new boiler, we have also opted for a John Guest UFH system to be installed in the new...
    • Chrismw1989
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    • Forum: Plumbing Jobs | The Job-board
  15. S

    Plumbers mate work needed

    Hi, my names Steve i'm 32 I completed my level 2 6035 with flying colours last year and I am having a knightmare trying to get a start with anyone. I have experience in maintenance and I have fitted toilets and wash basins and also radiators and copper and waste pipe work, I have my own tools...
  16. W

    pipework replacement - good/bad idea?

    Hi, I am upgrading a house (wooden frame, wooden clad, brick base - old forestry style). The plumbing and heating needs replaced (currently electric emersion and open fire back boiler). The pipe work that is in is 8mm external diameter. I know the current trend is to increase the...
  17. J

    Icos HE15 constant issues....

    Good morning I currently have an ideal Icos HE15 and I currently don't have heating or hot water. if I had the boiler off and then turned it back on again. I get the start up, then the number 1 comes up on the panel. Then everything clicks off and I get a constant zero and no burner...
  18. L

    Any employers looking to hire an apprentice?

    Hi there, I'm new to this forum, anyway I was just wanting to find out if there are fully qualified plumbers in Leeds who could possibly employ me until I'm fully qualified as I want to get to Level 3 and be gas safe, I am currently on Level 1 and I started in September. I would really...
  19. B

    Danfoss TP9000 boiler controls not working - currently have no heating or hot water

    Hi, I'm hoping someone might be able to help me. My boiler is currently not working, my gas is connected (gas cooker works) and I have power, and the power is getting at least to the controls (Danfoss TP9000). However the display is just flashing, if i push a button (any button) it will beep...
    • big_cat_sammy
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    • Forum: Plumbing Jobs | The Job-board
  20. R

    Gas engineer required - experience essential, diagnostic skills essential

    Good evening - we are a small plumbing and heating firm covering the West Kent area - Tonbridge, Tunbridge Wells and Sevenoaks. We install bathrooms, install and repair gas appliances, and cover all maintenance and emergency callouts. We are currently five people strong but are expanding all the...
    • RLP
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    • Forum: Plumbing Jobs | The Job-board
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