Danny.L
Badges: 3
Rep:
?
#1
Report Thread starter 6 years ago
#1
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!
0
reply
X

Quick Reply

Attached files
Write a reply...
Reply
new posts
Back
to top
Latest
My Feed

See more of what you like on
The Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

Personalise

Are you tempted to change your firm university choice on A-level results day?

Yes, I'll try and go to a uni higher up the league tables (55)
29.41%
Yes, there is a uni that I prefer and I'll fit in better (15)
8.02%
No I am happy with my choice (103)
55.08%
I'm using Clearing when I have my exam results (14)
7.49%

Watched Threads

View All