Electrical Circuits RQP- investigating factors affecting resistance RQP

Question 1

draw the circuit diagram for this practical

Answer 1

• cell, ammeter and voltmeter in series
• two circles on bottom left and right of circuit with an arrow coming off of each one labelled as crocodile clips
• a line above a ruler underneath crocodile clips, extending past clips on one end
• labled as thin resistance wire and metre ruler

Question 2

step 1

Answer 2

set up circuit in diagram

Question 3

step 2

Answer 3

connect crocodile clips to resistance wire 100cm apart

Question 4

step 3

Answer 4

record reading on ammeter and on voltmeter

Question 5

step 4

Answer 5

move oner clip 10cm closer (90cm apart)

Question 6

step 5

Answer 6

record new readings on ammeter and voltmeter

Question 7

step 6

Answer 7

repeat previous steps, reducing wire length by 10cm each time until a minimum of 10cm

Question 8

step 7

Answer 8

calculate each wire length’s resistance using V=IR (R= V/I)

Question 9

step 8

Answer 9

plot graph of resistance against wire length (should go up diagonally from left to right)