SME
Grade 8 Science · Problem type
Charges that pull together or push apart
Use this for “Two rubbed balloons are brought near each other. What happens?”
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Do they pull together or push apart?
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Assumptions
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Rubbing moves electrons: the balloon goes negative, the sweater positive.
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Electric forces act at a distance and grow as the charges come closer.
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Related lessons
Electric charge, current and simple circuits
Main lesson
Bulbs in parallel
Use this for “Two bulbs are wired in parallel across a 6 V battery. What current does each get, and what does the meter read?”
More bulbs in series
Use this for “A third identical bulb is added in series. What happens to the current and the brightness?”
Conductor or insulator?
Use this for “A gap in a circuit is bridged with one object at a time. Which ones make the bulb glow?”