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The voltage sensor

This page was translated from German with AI. It has not been checked by a native speaker. Original page in German

The voltage sensor measures the voltage. Like the current sensor it sends its values by Bluetooth to an app on the tablet. But it is connected quite differently: in parallel, and the circuit stays closed.
📄 Open worksheet (PDF, German)

The video

In the video the sensor is connected to a circuit of plug-in blocks – once correctly, once wrongly by mistake.

Subtitles are available in ten languages. Choose them at the bottom right of the video.

Contents of the video

  1. 0:00 Overview
  2. 0:10 The parts
  3. 0:22 In parallel
  4. 0:41 Built in wrongly
  5. 0:54 Measuring range
  6. 1:00 In short

The most important points

On top it has two sockets, a blue one on the left and a red one on the right. The button at the front switches it on; the lights show Bluetooth and battery.

For voltage you do not open the circuit. The two cables go to the two sides of the component, here left and right of the lamp.
For voltage you do not open the circuit. The two cables go to the two sides of the component, here left and right of the lamp.

In parallel

The voltage sensor goes in parallel, to the two sides of a component. The circuit stays closed. If the app shows a minus, the cables are swapped – that does no harm.

Built in in series by mistake: the lamp stays dark, because the sensor lets almost no current through. Nothing gets broken. Then connect it in parallel.
Built in in series by mistake: the lamp stays dark, because the sensor lets almost no current through. Nothing gets broken. Then connect it in parallel.

It measures up to 30 V. That is enough for everything the power supply delivers.

The worksheet

Here you can see the worksheet for the video (in German). The hints are printed upside down – turn the sheet only when you cannot get on by yourself. You can also open it as a PDF.

📄 Open worksheet (PDF, German)

The worksheet – Page 1
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The worksheet – Page 2
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The worksheet – Page 3
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Show the worksheet solutions
The worksheet – Page 4
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Try it yourself

Task

You are to measure the voltage at a lamp. How do you connect the voltage sensor – and how does that differ from the current sensor?

Show solution

The two cables go left and right to the lamp, the circuit stays closed (parallel). The current sensor, on the other hand, goes into a gap in the circuit (in series); the current has to pass through it.

Keep learning with a language model

You are my physics teacher. I am learning to measure with a voltage sensor: it goes in parallel to the two sides of a component, the circuit stays closed. The current sensor, on the other hand, goes in series. Ask me four short questions, one after the other, in which I have to decide which sensor is connected how. Always wait for my answer and then explain briefly.

How this was made: The idea and the choice of equipment are mine. A language model (LLM) drafted the script, the drawings, the worksheet and this page following my instructions. The devices are drawn from photos of our collection and from my own templates. The voice was generated with Qwen3-TTS, modelled on my own voice.

Limits and operation apply to the devices in our collection. If you work with other devices, follow what is written on the device and what your teacher says.

The videos, worksheets, texts and prompts in this series are licensed under CC BY 4.0: you may use, change and share them if you name the source.