Recent content by rikiki

Right so the circuit looks like the attached, thanks. I'll have a go at simplifying.

Thanks, So for the left hand side would the attached be acceptable? With the addition of the load on the right side of the circuit I'm really struggling to see how something similar could be achieved here? Thanks for your patience here, I'm really struggling to get a grasp of what's going on.

Ok thanks, So a node is, any point on a circuit where three or more circuit elements meet. I've tried to colour the diagram to show this. If this is right then the resistor which has the same two nodes as the top left resistor is the bottom left resistor. At the moment these are connected in...

Thanks for getting back so quick. I've amended the figure as recommended, please see attached. I know that for resistors connected in parallel, the supply current is equal to to the sum of the currents through each resistor, and that when resistors are connected in series, the total...

Homework Statement Find the Thévenin equivalent of the circuit shown in FIGURE 1. Homework Equations Any two-terminal network can be replaced by an equivalent circuit consisting of a voltage source and a series resistance equal to the internal resistance seen looking into the two...

Homework Statement Use the quotient rule to differentiate y=(〖2x〗^4-3x)/(4x-1) Homework Equations y=(v du/dx-u dv/dx)/v^2 The Attempt at a Solution Please also find attached attempt as jpeg for clarity, and textbook supplied answer...

ok thanks I've gone back to the drawing board and come up with this so far. got too engrossed in trying to find the quick way with a calculator. Hopefully this looks a bit more promising. Z= (Z_1 Z_2)/(Z_1+ Z_2 ) r= √(a^2+ b^2 ) θ=arctan b/a Z_1=4+j10 r = √(4^2+...

Homework Statement Given the equivalent impedance of a circuit can be calculated by the expression Z= (Z_1 Z_2)/(Z_1+ Z_2 ) If Z1 = 4 + j10 and Z2 = 12 – j3, calculate the impedance Z in both rectangular and polar forms. Homework Equations j2=-1 The Attempt at a Solution Z=...

answers to date, i'd be grateful if anybody is able to check they're ok. 2 a) Current=maximum amplitude ×sin (Angular frequency ×time+phase angle) I_((t) )=Im ×sin⁡(ωt+ θ) I_((t) )=15 ×〖sin 〗⁡(100πt+ 0.6) ∴ Amplitude = 15 Angular frequency=100π rad/s Phase angle=0.6 radians 2...

Perfect. Thanks very much. I'll get going on the answers. Thanks for your help, much appreciated.

Thanks for your prompt reply, that makes the application of the formula very clear. I'm still struggling to find any literature on where the actual 'general' formula comes from. I don't know if your able to help at all with this? my notes on this seem pretty sparce and can't seem to find...

Homework Statement The instantaneous value of current, i amp, at t seconds is given by: i = 15 sin(100π.t + 0.6) Find the value of; a) amplitude b) period c) frequency d) initial phase angel e) value of i when t = 2.5s f) time when current first reaches maximum value Homework...

Brilliant thanks for all your help.

Thanks for all your help. So ... 4I1 + 3I2 = 1 1 3I1 + 5I2 = 2 2 Multiply 1 by 3 12I1 + 9I2 = 3 Multiply 2 by 4 12I1 + 20I2 = 8 (12I1 + 9I2) - (12I1 + 20I2) = 3 - 8 -11I2 = -5 I2 = -5 / 11 I2 = 0.45 4I1 + 3I2 = 1 4I1 + 3x0.45 = 1 4I1 + 1.35 =...

Thanks for all your help to date. I've come up with a final figure of 0.95A for I3. Does this seem right?