PhysicsUK Connections

Connections.EXPLORE · CONNECT · UNDERSTAND YOUR COURSEOCR A · AS Physics Browse topics →
All apps ↗
55 ideas · 69 connections
Measuring motion without hiding uncertainty Small length errors can matter greatly in density Stress and pressure share units, but describe different loading Measuring Young modulus accurately Why wire diameter matters in resistivity A circuit diagram is a measurement plan A Planck-constant experiment needs uncertainty analysis Turn an investigation question into measurements Instrument choice sets the measurement limits Measure wavelength over several repeats of a pattern Practical skills1.1 Planning1.1.1 Implementing1.1.2 Measurements and uncertainty2.2.1 Kinematics3.1.1 Density and pressure3.2.4 Mechanical properties of matter3.4.2 Circuit symbols4.2.1 Resistivity4.2.4 Stationary waves4.4.4 Photons4.5.1
100%

Select a node to explore. Select a green line to follow a connection.

Drag to pan · scroll to zoom · arrow keys to move · 0 to fit

Physics connection Topic → subtopic
Explore the connections 69
PHYSICSUK CONNECTIONS
Physics connection

Instrument choice sets the measurement limits

OCR A AS Physics · Two ideas, one explanation

Resolution, range and zero offset affect what can be inferred from a reading. Choosing a suitable instrument is part of deciding the uncertainty, not a separate administrative step.

Fractional uncertainty = absolute uncertainty / measured value

Follow the reasoning

  1. Choose a range appropriate to the expected value.
  2. Check calibration or zero offset where possible.
  3. Record a justified uncertainty alongside the reading.
Specification outcomes (5)
  • 1.1.2(a) How to use a wide range of practical apparatus and techniques correctly.
  • 1.1.2(b) Appropriate units for measurements.
  • 2.2.1(a) Understand systematic errors (including zero errors) and random errors in measurements.
  • 2.2.1(b) Understand precision and accuracy in the context of measurement.
  • 2.2.1(c) Calculate absolute and percentage uncertainties when data are combined by addition, subtraction, multiplication, division or raising to powers.
Open the official OCR AS specification ↗

H156 v2.0 · May 2026

OFFICIAL EXAM-BOARD RESOURCES

See it in an exam

A curated collection of checked examples. Coverage is growing; this is not a complete past-paper catalogue.

ORIGINAL PHYSICSUK QUESTIONS

Put the ideas to work

More practice is on its way

No PhysicsUK question linked yet. New eligible questions appear here as the bank grows.

PhysicsUK · Built for understanding