formula

  1. W

    Formula

    Whats the formula for this question:- A current of 4.5A flows in a3.5 W resistor for 5.5 minutes. The energy dissapated is? Regards Mick Ward :confused::confused::confused:
  2. L

    Can you work this out

    what is the maximum permitted voltage drop of a cable supplied from 400v three phase. a.11.5v b.6.9v c.20v d.12v I know the answers c but I dont know what the formula is to get there. does anyone know
  3. E

    formula for working out ring main cable sizes

    Hi Can anybody remember the formula for working out ring main cable sizes (Cable Capacities). I know we use 32amp MCB with 2 x 2.5mm² but its been so long I cant remember the formula that proves 2.5mm² is capable of carrying a ring main load. Thank you in advance Sorry if this has been...
  4. B

    Volts drop

    How do, can any one help me with how to work out volts drop, what is the formula? thanks
  5. S

    Temperature coefficient formula help.

    Hi there Am studying 2330 level 3 and have come accross a formula I cant get my head round in my workbook. It shows the formula to calculate the difference in resistance with temperature change. R1/R2 = (1 + alpha t1)/(1 + alpha t2) The worked example shows a field winding of a dc motor with...
  6. P

    electrical formula

    Can anyone send me a link to work out how much amp can run through a cable and at what length the cable can be ie shower 6mm csa 15m long
  7. bonjovi

    formula

    what is the formula for watts into amps for a 3phase system did no but forgot many thanks
  8. H

    help with college formula please!

    Just been doing some college work. Was calculating if supp equip bonding was required in a bathroom. The formula given for an mcb is R < 50V / Ia. Ia being the fault current for a particular mcb to disconnect in a certain time. My question is, as there are likely to be various circuits in...
  9. A

    Calculations and Formula

    Below is a list of links that i have looked up to cover popular formula and enter the data and retrieve the answer type sites, please vote your favorites. This data could be used to set up another section if possible. 1) http://www.ifigure.com/engineer/electric/electric.htm 2)...
    • Andy Smith
    • Thread
    • aus calculations formula
    • Replies: 2
    • Forum: Australia
  10. A

    formula and calculation aid section

    Wondered if it would be of use to have a formula and calculation aid section, ie fill in the blanks and get the answeer type thing. :) Dont know how difficult it would be to do :o Any opinions?
  11. V

    Formula Help.

    Hi, A simple question. I am studying to be an electrcian and finding the books sent to me dont explain the formula's very well. For example, one of the questions is: An electric lamp has a filament resistance of 534 Ohms when connected to a 230V supply. The current flowing through it would be...
    • Vassy
    • Thread
    • aus formula help
    • Replies: 15
    • Forum: Australia
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