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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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    90.57971 by plastic brain - a.k.a a calculator..


    15.5A by a rule and pen on the back of an envelope. (Guessed the angle by the "Rack of the eye" method)


    Next calculation I might use a "Guessing Stick" Well that`s what our tutors used to call a slide rule as calculators (plastic Brain) were just starting to appear on the scene. 

    I can`t remember a slang name for those adding machines that were like a mini cash register with levers, a handle and moveable carriage. We thought they were brill though, 4 in the whole school and was a treat to get to use one for a few minutes , I guess it was the second half of the 60s and I think they were about £40 each which was a lorra lorra money back then


    Mind you, our school had a maths teacher (not my teacher, I had one of the others) that actually gave one girl 101% in a maths test - 101% ? yes 101%, she answered all the questions correctly plus her work was so neat and so well set out that he gave her an extra one per cent on top. 101% and that was at a Grammar type school !
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  • 0
    90.57971 by plastic brain - a.k.a a calculator..


    15.5A by a rule and pen on the back of an envelope. (Guessed the angle by the "Rack of the eye" method)


    Next calculation I might use a "Guessing Stick" Well that`s what our tutors used to call a slide rule as calculators (plastic Brain) were just starting to appear on the scene. 

    I can`t remember a slang name for those adding machines that were like a mini cash register with levers, a handle and moveable carriage. We thought they were brill though, 4 in the whole school and was a treat to get to use one for a few minutes , I guess it was the second half of the 60s and I think they were about £40 each which was a lorra lorra money back then


    Mind you, our school had a maths teacher (not my teacher, I had one of the others) that actually gave one girl 101% in a maths test - 101% ? yes 101%, she answered all the questions correctly plus her work was so neat and so well set out that he gave her an extra one per cent on top. 101% and that was at a Grammar type school !
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