Question 1
What is a correct
statement of Ohm’s law?
A The
potential difference across a component equals the current providing the
resistance and other physical conditions stay constant.
B The
potential difference across a component equals the current multiplied by the
resistance.
C The
potential difference across a component is proportional to its resistance.
D The
potential difference across a component is proportional to the current in it
providing physical conditions stay constant.
Reference: Past Exam Paper – June 2007 Paper 1 Q31
Solution:
Answer:
D.
Ohm’s law: V ∝ I
The potential difference
across a component is proportional to the current in it providing physical
conditions (such as temperature, pressure …) stay constant.
From this proportionality,
we have = V = kI where k is a constant.
We know that the constant
k is the resistance.
For Physics 5054, they are asking you to design an experiment to prove the Principal of Moments. Worth 4 marks, from a past paper.
ReplyDeleteYou may use masses on a metre rule pivoted at the centre. By changing the position and amount of masses on each, clockwise and anti-clokcwise moments are produced.
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