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# Unit 3 resistance and potential difference question..

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Why bother with a post grad? Are they even worth it? Have your say! 26-10-2016
1. Y'all could someone help me with this. I don't know how this experiment would be set up and what this experiment is even trying to ask???

"A student is asked to investigate how resistance varies with potential difference for a 12V, 24W bulb. Write a plan for an experiment to do this using standard laboratory apparatus and a graphical method"

Someone pleaaaasee break this down for me.
2. Sorry you've not had any responses about this. Are you sure you've posted in the right place? Here's a link to our subject forum which should help get you more responses if you post there.

You can also find the Exam Thread list for A-levels here and GCSE here.

Just quoting in Puddles the Monkey so she can move the thread if needed
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3. (Original post by slaya)
Y'all could someone help me with this. I don't know how this experiment would be set up and what this experiment is even trying to ask???

"A student is asked to investigate how resistance varies with potential difference for a 12V, 24W bulb. Write a plan for an experiment to do this using standard laboratory apparatus and a graphical method"

Someone pleaaaasee break this down for me.
Hiya! What subject is this for?
4. I'll try my best to answer this.

You should start off by drawing the circuit required, here they've asked for a simple set up with a means to know Resistance and voltage, to do so you need to show a circuit with:
a) Power Supply (12V)
b) Variable Resistor
c) A voltmeter connected in PARALLEL with the resistor
d) An ammeter connected in SERIES with the resistor

Follow by writing why you've used the voltmeter and ammeter, any reasonable explanation will get you marks such as the voltmeter is accurate to +-0.5 volts and the ammeter is accurate to +-0.5 amps

Describe how will you carry out the experiment and what kind of data will you collect, state the independent and dependent variable. Now, say that you'll change the length in the variable resistor to get different values for V and I (at least 8-10, with consistent significant figures), for each reading of V and I calculate the resistance by using the formula R= V/I, plot a graph of V against R.

Comment on precautions such as turn off the circuit after every reading to avoid the resistor being heat up.

Comment on safety, low risk experiment as the volatage is very small or wear rubber gloves to avoid getting shocked.

Hope I could help.

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