Electristity question

Well I got 4.1234v.... Just multiply my answer by 4 and you've got 16.4v which is close enough!

I'm sure someone who can actually help you will be here soon!

There are two wires going around the circuit, this surely means they are parallel wires? Does that help?

So how do you find the emf?

The equation for emf is E = V + Ir and you don't have internal resistance


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Maybe there is no internal resistance? Do you have resistance in each wire? Do you have overall current?
Work out total resistance in parallel, then use E=IR

I'm not 100% sure this is correct, but after i left the exam in january I wish i did this.

EDIT: sorry about the mistake, the internal resistance is in the copper wire i believe, and the total internal resistance 1/r = 1/0.98 + 1/0.98 is it not?

Let me know how you do, that's how I think its done my answer is 3.06V or 13.0V, do you know the answer?

The answer is 16.1v and the solution is that they do:

12 + 2 x 2.04 = 16.1 V

No idea what you do


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Haha thats weird, i said 3.06 or 13.0 add them its 16.06 which is 16.1 1dp

There is 12V across the source, as stated in the question. Then, visualise the circuit, paying particular attention to the way that the wires are organised (parallel/series). Then use the appropriate circuit rules to work out the total emf, which is the solution as given. I did this paper in January and got above 90%.

90% and 94% that is amazing, what tips could you give me in order to get that? I got 55/70 which was 1 mark of an A which was annoying, I found out I got full marks in the quantum and particles bit and totally messed up in the electristy bit


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