Grade 7 Integrated Science · Strand 1: Scientific Investigation · Laboratory Apparatus & Instruments
Electrical Instruments
A short Grade 7 Integrated Science lesson for the CBE curriculum, part of Scientific Investigation: Laboratory Apparatus & Instruments. Learn it on any phone with notes and slides, then check yourself with a quick quiz and earn XP. This lesson is free.
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5 questions from this lesson’s quiz. Start the lesson to answer them and see the right answers.
1. A learner wants to measure the current through a torch bulb and the potential difference across it. How should the two meters be connected?
- A. Both meters in parallel with the bulb
- B. Both meters in series with the bulb
- C. Ammeter in parallel; voltmeter in series
- D. Ammeter in series; voltmeter in parallel
2. A laboratory ammeter reads 0.35 A. What is this current in milliamperes (mA)?
Type your answer (in mA) in the lesson.
3. Why must an ammeter have a very low internal resistance?
- A. So that it does not reduce the current it is measuring
- B. So that almost no current flows through it
- C. So that it can measure voltage as well
- D. So that it can be connected in parallel safely
4. Name the error caused by viewing the needle of an analogue meter from an angle instead of directly in front of it.
Type your answer in the lesson.
5. A learner tests four objects in a circuit with a bulb and an ammeter. Which object will make the bulb light and the ammeter deflect?
- A. Plastic ruler
- B. Dry wood
- C. Graphite pencil lead
- D. Rubber eraser
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