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Electricity circuits

Is (a) correct?
ImageUploadedByStudent Room1423439280.648154.jpg


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Original post by ohnanailikenanas
Is (a) correct?
ImageUploadedByStudent Room1423439280.648154.jpg


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Yes, it's correct.
Thanks! :smile:


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ImageUploadedByStudent Room1423439913.276702.jpg What about (b)? :smile:


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Original post by ohnanailikenanas
ImageUploadedByStudent Room1423439913.276702.jpg What about (b)? :smile:


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Nope.

How will 100V be developed across the 40 ohms resistor when the supply is only 12V?

The total resistance has changed (gone from 30 ohms to 60 ohms) so the current must also change.

You need to calculate a new current and then find the p.d. across the 40 ohm resistor.
(edited 9 years ago)
Hm, ok. So would it be this? ImageUploadedByStudent Room1423440504.900381.jpg


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Original post by ohnanailikenanas
Hm, ok. So would it be this? ImageUploadedByStudent Room1423440504.900381.jpg


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Correct.
Thank you :smile: Is (c) the current has changed?


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Original post by ohnanailikenanas
Thank you :smile: Is (c) the current has changed?


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You need to state that the current has fallen because the total circuit resistance has increased.

i.e. the current now flowing in the 20 ohm resistor has fallen and since V = I x R, then the p.d. developed across the 20 ohms resistor must also fall.
Okay, thank you very very much for all your help. I appreciate it! :smile:


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Um, actually I did... I tried the questions and asked if they were correct and if they weren't someone helped me so why don't you mind your own business? At least I understand it more now.


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Ha some smartass deleted their comment.


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Why'd you delete your comment @BrownEyedGirl92 ??? Hmm


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