Investigating resistance (Required Practical)

Question 1

name all of the equipment that you are going to use

Answer 1

battery
A meter
volt meter
length of wire

Question 2

what are you using the A meter for

Answer 2

to measure the current in the circuit

Question 3

what do you use a volt meter for

Answer 3

potencial difference in the wire

Question 4

what is the equation to calculate the potential difference in a circuit

Answer 4

resistance = potential difference
———————-
current

Question 5

what are the steps to the practical to check the resistance depending on the length of the wire

Answer 5

1. attach a wire to a meter ruler using tape
2. connect the wire into the rest of the circuit by using crocodile clips
3. this will allow you to move the crocodile clips further away from each other increasing the length
4. this will allow you to measure the length of the wire and mess sure the resistance in the circuit

Question 6

what does the graph show you

Answer 6

the resistance to the wire is directly proportional to the length

Question 7

what are some problems that you can face when you do this experiment and how you could solve this issue

Answer 7

you can get a 0 error (when the value on measuring device should be 0 but it still gives a reading) which can be caused by the crocodile clip not being exactly at 0
solution: subtract the 0 error from all fo you readings

heating- if the temperature of the wire increases then the resistance of the wire also increases
solution: use a low potential difference to key the current low on reduce heating in the wire and only turning on the current when taking a reading (turn off the current between readings)

Question 8

what other piece of equipment can you use for a long wire

Answer 8

variable resister