Ohm's Law Laboratory

Explore how potential difference, current and resistance are related.

V = I × R

Experiment controls 01

V = I × R

Voltage (V)6.0 V

0 V12 V

Resistance (R)30 Ω

10 Ω200 Ω

Power supply

Show circuit current

Show voltage reading

Observation: At 6 V and 30 Ω, the current is 0.20 A. Try changing one variable at a time.

Experimental workbench ● POWER ON

LOW-VOLTAGE DC CIRCUIT · SCHEMATIC WORKBENCH

AMMETER · CURRENT I0.200 ACircuit current

VOLTMETER · VOLTAGE V6.00 VPotential difference

Live analysis 02

V–I CHARACTERISTICSlope = 30 Ω

For a fixed resistance, current increases in direct proportion to voltage.

Procedure

Set a voltage and resistance.
Switch on the DC supply.
Observe the ammeter and voltmeter.
Change voltage while keeping resistance fixed.
Compare the readings with the V–I graph.

Quick check

If voltage doubles while resistance stays constant, what happens to current?

Observation notebook 0 readings recorded

Trial	Voltage (V)	Resistance (Ω)	Current (A)	Power (W)
No observations yet. Adjust the controls and record a reading.

Guided experiment · progress tracker

Complete each stage of the practical.

0 / 5 completed

Read the aim and principle Set voltage and resistance Switch on and observe readings Record at least two observations Complete the knowledge check

Change one variable at a time. Keep resistance fixed while changing voltage to observe direct proportionality.

Apparatus matching · drag or tap

Tap an instrument, then tap its function (or drag it).

Ammeter

Measures current

Voltmeter

Measures potential difference

Resistor

Provides resistance

0 / 3 matched

Knowledge check

A 20 Ω resistor is connected to a 10 V supply. What current flows?

Choose an answer.

Practical notebook · export notes

Student observations and conclusion

Ohm's Law · Interactive Investigation Studio

Build, test, diagnose and explain a circuit — not just observe a preset simulation.

⭐ Score: 0🏅 Level: Beginner✓ Tasks: 0 / 5

1 · Component tray

Drag a component into each matching circuit position, or tap a component and then tap a position. Build a valid series circuit.

🔋 Battery

⏻ Switch

▤ Resistor

Ⓐ Ammeter

Ⓥ Voltmeter

Power sourceDrop battery here

ControlDrop switch here

LoadDrop resistor here

Current meterConnect ammeter in series

Voltage meterConnect voltmeter across load

Complete all five positions, then validate your circuit.

2 · Circuit behaviour

A correct arrangement places the ammeter in series and the voltmeter in parallel across the resistor. This simplified builder validates the arrangement and calculates an ideal circuit once validated.

Supply voltage (V) Resistance (Ω)

Circuit not yet validated.
Use I = V ÷ R after completing the builder.

Learning point: a voltmeter is connected in parallel; an ammeter is connected in series.

Fault-finding bench

Inspect the symptom, select the most likely fault, then submit your diagnosis. Each round uses a different fault scenario.

Symptom: The circuit is switched on, but the ammeter reads 0.00 A.

Your diagnosis

Think about whether the circuit path is complete.

Diagnostic checklist

Check continuityIs there a complete conducting path?

Check meter placementAmmeter: series. Voltmeter: parallel.

Check component valuesCompare expected current using I = V/R.

Tip: a zero reading often indicates an open path, but always inspect the meter connections too.

Investigation missions

Use the main simulator controls above to explore each target. Mark a mission complete only after you have tested and understood it.

Mission 1 · Target currentSet R = 20 Ω and adjust voltage to obtain 0.30 A. Mission 2 · Unknown resistanceFor V = 6 V and I = 0.20 A, calculate the resistance. Mission 3 · Verify the lawKeep resistance fixed and record at least three voltage readings. Mission 4 · Predict before testingPredict how current changes when resistance doubles at fixed voltage.

0 of 4 investigations completed.

Investigation prompts

Mission 1: Use I = V/R. What voltage is needed for 0.30 A through 20 Ω?

Mission 2: Rearrange Ohm's law: R = V/I.

Mission 3: Compare V/I for each observation. Is the ratio approximately constant?

Mission 4: At constant voltage, doubling resistance halves current.

Record evidence in the Practical Record tab. Your main simulator readings and notebook remain available above.

Timed-style mastery challenge

Answer the question, then check your reasoning. Correct answers earn points once per challenge.

A 12 V battery is connected to a 4 Ω resistor. What current flows?

Use I = V/R.

Achievement board

No achievements yet. Earn points by validating your circuit, diagnosing faults and solving challenges.

Points reward evidence of learning, not speed. Repeatedly clicking a correct answer does not award repeated points.

Practical record builder

Compile a structured practical note using the readings recorded in the original simulator.

Aim / conclusion Sample calculation

Includes the original simulator's recorded observations.

What a good record includes

Aim and principleState the relationship being investigated.

Apparatus and circuitList the components and describe meter connections.

Observation tableRecord voltage, resistance and current.

InferenceExplain whether the evidence supports Ohm's law.

V3.1 · Circuit Wiring, Data Analysis & Teacher Assessment

Extended practical workbench with terminal-level connections, evidence-based tasks and a structured assessment record.

1 · Connect the circuit terminals

Select two terminals to connect them with a wire. Build the series path: battery + → switch 1 → switch 2 → ammeter + → ammeter − → resistor 1 → resistor 2 → battery −. Then connect the voltmeter across the resistor.

Selected terminals connect as a pair. Required wire pairs:

No wires connected yet.

Start by selecting Battery + and Switch 1.

2 · Circuit response

The idealised model checks the required electrical topology. Switch state and component values determine the calculated response.

Switch state Supply voltage (V) Resistance (Ω)

Validate the wires to calculate the circuit response.

Model assumption: ideal battery, wires and meters; a single ohmic resistor. This is a learning simulation, not a hardware-grade circuit solver.

3 · Auto-checked investigations

Enter your answer and submit it. Completion is awarded only when the numerical result is correct.

Mission A — What voltage gives 0.30 A through 20 Ω?

Mission B — Find R when V = 6 V and I = 0.20 A.

Mission C — If voltage stays fixed and resistance doubles, current will…

4 · Observation data & V-I graph

Add experimental readings to build a graph of voltage (vertical axis) against current (horizontal axis). The gradient estimates resistance.

Voltage (V)Current (A)

Add at least two readings to estimate the gradient.

Trial	V (V)	I (A)	V/I (Ω)

5 · Teacher assessment & student progress

Student name Class / section

Circuit construction & wiring0 / 20

Investigation answers0 / 20

Fault diagnosis0 / 20

Data collection & graph0 / 20

Reflection & practical record0 / 20

Assessment score: 0 / 100

Teacher feedback

6 · Expanded practical report

The report combines the practical structure, readings, graph analysis, auto-checked tasks and teacher assessment.

Precautions / sources of error Conclusion

The report is generated locally in your browser.