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Interactive Ohm’s Law Lab: Voltage, Current and Resistance

Use V = IR in a virtual circuit, change one variable, record current and explain the pattern with an English-first worksheet.

Suggested: lower secondary science; English A2 support • 25 minutes

Ohm’s law lab Printable student activity ↓

Your learning goal

Predict current using I = V ÷ R and use three readings to explain a fair test.

Understand the idea

Voltage is measured in volts (V), current in amperes (A) and resistance in ohms (Ω). For an ohmic conductor under unchanged physical conditions, V = IR. At fixed resistance, more voltage produces more current.

An ammeter is connected in series. A voltmeter measures between two points and connects across the resistor. In this virtual lab you can compare meter arrangements without handling real electrical equipment.

Change voltage while keeping resistance fixed. Changing both at once makes the cause of a changed current harder to identify. This ideal resistor model does not describe every real device, such as a warming filament lamp.

Worked example

  1. Set V = 6 V and R = 5 Ω. Calculate I = 6 ÷ 5 = 1.2 A.
  2. Keep R = 5 Ω and double V to 12 V. I = 12 ÷ 5 = 2.4 A: the current doubles.
  3. Return to 6 V and use 10 Ω. I = 0.6 A: doubling resistance at fixed voltage halves current.

Try it step by step

  1. Open the Ohm’s law lab and use the correct meter setting.
  2. At R = 10 Ω, predict and record current for 2 V, 4 V and 6 V.
  3. Explain your evidence using “When voltage increases…, current… because…”.
Ohm’s law lab

Printable student activity

Print this page to use the English-first worksheet. Teacher notes and answers are excluded.

CATCHIE · STUDENT ACTIVITY

Interactive Ohm’s Law Lab: Voltage, Current and Resistance

Name: ____________________ Class: __________ Date: __________

Goal: Predict current using I = V ÷ R and use three readings to explain a fair test.

  1. Keep R = 10 Ω. Make a table for V = 2, 4, 6 V: predicted I (A), observed I (A).

  2. At V = 6 V, change R from 5 Ω to 10 Ω. What changes? What stays the same?

  3. Explain the pattern in English. Use: “I kept ___ constant. When ___, the current ___.”

https://catchie.link/en/topics/ohms-law/

Teacher notes and sample answers

At 10 Ω: 0.2 A, 0.4 A, 0.6 A. At 6 V: 1.2 A at 5 Ω and 0.6 A at 10 Ω. The explanation must name the fixed variable. Meter errors are for virtual exploration only; never place an ammeter across a real supply.