# Multiples and sub-multiples, abbreviations and indices

### Explanation of question 10

A current of 3mA flows through a resistor when a p.d. of 12V is connected across its terminals. The resistor has a resistance value of

1. 0.25
2. 4
3. 250
4. 4 k

The answer is :- 4

R =

= 12
3 x 10-3

= 4
10-3

= 4 x 10-3 = 4 k

(note the 'small' k).

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