Physics resistors please HELP Watch

Danny.L
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Report Thread starter 3 years ago
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http://www.ocr.org.uk/Images/58045-q...nd-photons.pdf
1d)ii)
I have no idea how I have gotten this wrong, could someone please help?
in the alternative design it is a 10 ohm bulb placed in parallel with a 100 ohm resistor. There are 40 sets of these.
They want to know the current drawn.
Okay, so surely you simply work out the resistance per parallel set and times by 40.
So 1/10 + 1/100 = 11/100
(11/100)^-1 = 9.09(rec) times this by 40 = 363.63(rec)
240/363.63 (rec) = 0.66 A
The answer is 0.31 and I have no idea how, could someone please help me out here please!?
Have my exam very soon!
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