Investigating resistance (Required Practical) Flashcards

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1
Q

name all of the equipment that you are going to use

A

battery
A meter
volt meter
length of wire

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2
Q

what are you using the A meter for

A

to measure the current in the circuit

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3
Q

what do you use a volt meter for

A

potencial difference in the wire

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4
Q

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

A

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

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5
Q

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

A
  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
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6
Q

what does the graph show you

A

the resistance to the wire is directly proportional to the length

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7
Q

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

A

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)

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8
Q

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

A

variable resister

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