Recent content by SGL18

i used the formula λ=h/(Em)^1/2 and correctly got 1eV to equal 1.23x10^-9. For 100eV would i just multiply 100 by 1.6x10^-19? then plug it back into the equation?

Homework Statement light from an atomic hydrogen lamp falls on a diffraction grating with 200 lines per centimetre. on a screen 2.5 m away, the distance between green spots of the first and second order spectra is 2.43cm while the distance between a green spot and a red spot both of the first...

Homework Statement What is the DeBroglie wavelength of an electron whose energy is (a) 1.0eV (b) 100eV? What is the kinetic energy in eV of an electron whose DeBroglie wavelength is that of visible red light at 650nm? Homework Equations λ=h/p = h/mv h = Planck's constant...

Alright i'll give that a shot! cheers :)

the question asks for the primary winding resistance and reactance, that's what I'm unsure how to solve, what i have done is just added the resistances and reactances given

This is what I have been able to work out so far, I think it's correct: Impedance for primary side: Z = R+jX so Z = 1+j2 which in polar form gives 2.2/_63.4 Impedance for secondary side: Z = R+XL so XL = ωL = 2∏ x 50 x (6.37x10ˆ-3) = 2 so 2/_90 or in polar form 0+j2 than added this...

V=IR I =V/R R=V/I P=VI ω=2∏f P=I2R P=V2/R any of these?

hey tiny tim! This is the problem sketched out, i think its correct! sorry for my poor drawing skills!

I don't even know where to start! anyone got any ideas? A transformer having a 2:1 turns ratio is considered to have a primary resistance and reactance of 1ohm and 2ohm respectively, and a secondary resistance and inductance of 1ohm and 6.37mH respectively. Magnetising current for this...

i Just mananged to solve this using Apparent power instead of real power! P=IV so I=P/V or rather I=S/V then P loss= I (squared)R! Thanks for replying anyway tiny-tim! just started a new power engineering class soe rest assured I'll have plenty more questions! :)

i've used the power factor=real power/apparent power (P/S) and from the power triangle i can get the real, reactive and apparent power. Can also get the impedance angle from the power factor using inverse cos function! (cos-1 0.6 = 53.13) and i know other formulas such as real power=p=V.I.cos...

I need help with this tutorial question I cannot solve! a consumer demands 50kW at an effective voltage of 230V. supply system can be represented by a 0.1ohm resistance. Find the transmission losses in the event of the load being supplied with a power factor of 0.6 lagging. I know the...