Recent content by NewAgeBerean

no one?

surely someone is doing this practical tomorrow...

Unit 5 practical tomorow! Anyone doing the edexcel practical tomorow? I've been revising through past papers practicals, and saw some more on the edexcel website. I looked through and there are some things I'm hoping do not come up tomorrow - and there are not mark schemes to 3 of the older...

Its ok, i found out the answer they have is incorrect. Using P/V to get I gives me around 15A using the r.m.s. and around 10A using the peak value. They are using a current of 21.2A - where that comes from i don't know. Obviously they made a mistake. Thanks for all the replies

so in this case which V do i use - average or peak? Are my previous working out correct? and is the mark scheme answer to the question incorrect? (they used 21.2 A)

Ok i use B = (U0)(I)/ 2pi (0.3) = (4.7*10^-7)(14.58) / 2pi (0.3) = 3.64*10-6 T They have 21.2 A. and have B= 1.5*10-5 T

So how can u convert average voltage to actual voltage? on the working out they have a current of 21.2 A. How does that happen? are my formulas wrong?

Homework Statement A child sleeps at an average distance of 30cm from household wiring. The mains supply is 240V r.m.s. Calculate the max possible magnetic flux density in the region of child when the wire is transmitting 3.6 kW of power. Thats the first part. I don't really understand...