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October 31, 2020, 08:54:08 pm

Author Topic: circuit question  (Read 712 times)  Share 

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circuit question
« on: May 13, 2013, 05:47:06 pm »
I have a few questions regarding Q8 of Chapter Review 5 in the Heinemann textbook (for those who cant be bothered looking it up in the textbook/dont have one, I have uploaded a picture).

Few things im not sure about:
-how the ground/earth connection works (does all the 'voltage' go to the ground, meaning that point is zero? wouldn't that mean the rest of the circuit does not have any voltage?)
-worked solutions say the resistance of LDR in 3Wm^-2 intensity of light is 43k ohms. How is it even 43k? Wouldn't 3 Wm^-2 = 3000mWm^-2 (the graph uses units of mWm^-2). Hence the R should be about 12k...