# A physics student is recording measurements taken during an experiment. The student records a current of 0.000 006 A and a power of 3 500 000 000 W. Explain how the student could rewrite each of these measurements using the most appropriate prefix, and state the name and symbol of the prefix used in each case.

> Edexcel GCSE Physics (1PH0) — 1.1 Key concepts of physics · Explain · 4 marks

## Mark scheme (4 marks)

1. States that 0.000 006 A should be rewritten using the prefix micro (µ), giving 6 µA
2. Links micro to the correct multiplier of ×10⁻⁶ (or 'one millionth') to justify the choice for 0.000 006 A
3. States that 3 500 000 000 W should be rewritten using the prefix giga (G), giving 3.5 GW
4. Links giga to the correct multiplier of ×10⁹ (or 'one billion') to justify the choice for 3 500 000 000 W

## Key terms

- [prefix](https://www.gradenine.co.uk/glossary/prefix)

## Related

- [Revision notes for Edexcel GCSE Physics (1PH0)](https://www.gradenine.co.uk/learn)
- [How to answer "Explain" questions](https://www.gradenine.co.uk/tools/command-word-cheatsheet)
- [Practice this with AI marking (free)](https://www.gradenine.co.uk/start)

---
Source: [GradeNine](https://www.gradenine.co.uk/q/a-physics-student-is-recording-measurements-7826caa2) · Published by Druglandscape Ltd.