Current, voltage and resistance

Explanation of question 5

A resistor has a resistance of 2 when

  1. a current flow of 1A produces a p.d. of 2V across its ends
  2. a voltage flow of 2V produces a current of 2A across its ends
  3. a current flow of 2A produces a p.d. of 2V across its ends
  4. a voltage flow of 1V produces a current of 2A across its ends

The answer is :- 1

Ratio = 2, therefore the p.d. has a value twice as large as the current.

A p.d. appears across a component; current flows though a component.

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