1992 paper1 (more pain and misery )

[ANDYQ]

q34 paper 1 help

[ANDYQ]

paper 2 q5 tryed to use y=mx+c but cannot take exact points

[ANDYQ]

won,t be on to around 7pm tommorrow got a 9h shift at work (goin for the sympathy vote guys)

[Admin]

Paper I Q34 Andy the loop of wire has resistance 30 ohms, it is connected to the4 circuit at the midpoint, that gives you 2 paths for the current to flow each has a resistane of 15 ohms. To solve the question find the resistance of a circuit that has two 15 ohm resistors in parallel.
Paper II Q 5 Take the following points (0,2.0) and (0.5,1.2) this makes a gradient of -1.6 so internal resistance = 1.6 ohms.

[Connor Einstein]

i cannot get questions 5(ai) (b) or 8bii

[Admin]

5.a.i. Draw the circuit given, add an ammeter put the variable resistor between the output terminals and put a voltmeter across the variable resistor. Set the variable resistor to a resistance, press a key and record both meter readings in a table. Change the resistance of the variable resistor and repeat the experiment. Collect 5 sets of data and plot in a graph.
5.b. The reading from figure 1 gives you the EMF (E), the reading on figure 2 gives you the voltage across the variable resistor. Because we know R and V in figure 2 we can work out I, I = V / R. Then using the equation E = IR + Ir where we know E, I and R we get r = (E- IR) / I.
8.b.ii. Clue is question "the pads are picking up a sinal from mains wiring" in the inverting mode this signal will be displayed on the monitor, in the differential mode the signal from 1 pad at the positive input will be cancelled by the same signal going into the negative input.

[ANDYQ]

cheers sir

[Scoobasteve]

paper 2, question 2?