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YOUR PARTICIPATION FOR THE GROWTH OF PHYSICS REFERENCE BLOG

Tuesday, February 13, 2018

What is a correct statement of Ohm’s law?



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.

2 comments:

  1. For Physics 5054, they are asking you to design an experiment to prove the Principal of Moments. Worth 4 marks, from a past paper.

    ReplyDelete
    Replies
    1. You 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.

      Delete

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