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Answers Please. Electrical Technology.

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1. A load of 2.5kW takes a current of 12 Amp from a 230 Volt supply. Calculate the power factor.


2. Three single phase loads are to be connected to a three phase supply. All at unity power factor. The loads are,


i, 60 Amp.


ii, 50 Amp.


iii, 40 Amp.


By any method determine the neutral current.


Z.
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    Agree 330E  =30 W and all that - but in my defence,  the original question did not specify rotation.

    Of course if it had, I'd have had a 50% chance of getting that wrong as well...

    Looking at your workings, they are elegant and general, but I must admit while I fully understand complex no.s and use them for work I find to couch explanations as magnitude and angles them more visual in some way - I like to actually close my eyes and see the cogs rotating in the mathematical model, and imagine the electrons as rushing around, rather than just crunching the numbers (it also greatly increases my accuracy - the chance of spotting an error is increased by knowing from the visualisation roughly what sort of size and direction  the answer ought to  be.. Without that my chances of being off by  pi, or two or -1  or j increase rapidly with the no. of steps in the calculation).  (not good enough for spotting 17 instead of 20 something though)

    It does get some funny looks when I do this at work, and refer to 'gear ratios' and 'missing teeth' when comparing harmonic frequencies and phases in complicated systems though.

    M.
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  • 0
    Agree 330E  =30 W and all that - but in my defence,  the original question did not specify rotation.

    Of course if it had, I'd have had a 50% chance of getting that wrong as well...

    Looking at your workings, they are elegant and general, but I must admit while I fully understand complex no.s and use them for work I find to couch explanations as magnitude and angles them more visual in some way - I like to actually close my eyes and see the cogs rotating in the mathematical model, and imagine the electrons as rushing around, rather than just crunching the numbers (it also greatly increases my accuracy - the chance of spotting an error is increased by knowing from the visualisation roughly what sort of size and direction  the answer ought to  be.. Without that my chances of being off by  pi, or two or -1  or j increase rapidly with the no. of steps in the calculation).  (not good enough for spotting 17 instead of 20 something though)

    It does get some funny looks when I do this at work, and refer to 'gear ratios' and 'missing teeth' when comparing harmonic frequencies and phases in complicated systems though.

    M.
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