Apparatus, methods and safety
Apparatus choices must be precise enough for the task, while the method controls risk without preventing useful measurements.
A labelled arrangement must show how each measurement is made and how specific hazards are controlled.
By the end of this lesson, you can:
- select suitable measuring instruments;
- describe apparatus arrangements clearly;
- match instrument resolution to the measurement;
- identify hazards and precautions.
Choosing instruments
Match range and resolution to the quantity. Use a micrometer for a thin wire, calipers for an external diameter, and a metre rule for larger lengths.
Describe the arrangement
State exactly where instruments are placed and how readings are obtained. A labelled diagram can communicate geometry, electrical connections and reference points efficiently.
Risk and control
Name a specific hazard, state the possible harm and give a practical precaution. For a hot component, allow cooling or handle it with insulated tools; for toppling masses, use a tray and secure the stand.
Try another worked problem
Attempt the question yourself, then reveal the examiner-style solution when you are ready.
Safe method
Give one hazard and control for a loaded wire experiment.
CHECK YOUR ANSWERReveal solution
Falling masses may injure feet; use a tray/stop beneath them and keep feet clear.
Mastery check
Which instrument is most suitable for measuring a thin wire's diameter?