Could someone pls tell me why the answer is D in q 5? Why not A?
And in q 6 why and how is the answer A? Wh not C??
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Unit 2 mcq prob watch
- 17-02-2018 19:37
- 17-02-2018 19:53
In Q5, if one of those parallel lamps goes out, the resistance of that bit increases, therefore the resistance in the full circuit increases and the current decreases so N gets dimmer.
For 6, think of P = I²R, P=V²/R, rearrange them for R= and see which one, when converted to units, would match the answers given.Last edited by phys981; 17-02-2018 at 19:55.
- 17-02-2018 20:07
Ohhh I forgot to consider resistance and in q6 I had arranged the formula wrong! ><
Thank you so sooo much! May you lead a happy, fulfilling life