Year 8 · Summer Second Half
Physics
5 lessons from 1 unit.
Unit P8 · lessons 3 to 7 of 7
Put an ammeter either side of a bulb and both read the same. Follow that one fact from a torch to a junction, a voltmeter, an ohm and a cable that is copper inside and plastic outside.
- 03Current at a junctionSystemThree ammeters round one split in the wire. Two of the readings always add up to the third — whatever you put in the branches, and however lopsided the split.Open this lesson
- 04Potential differenceModelA voltmeter never goes in a circuit. It goes across a part of one, and it answers a different question from an ammeter: not how much is flowing, but how hard it was pushed through there.Open this lesson
- 05ResistanceQuantitativeResistance is not something you measure directly. You measure the push, you measure the flow, and you divide one by the other. That ratio is the number.Open this lesson
- 06Conductors and insulatorsClassifyConductor and insulator are not two kinds of thing. They are the two ends of one number, and that number runs across more than a million million.Open this lesson
- 07Building and measuring a circuitInvestigationA meter in the wrong place does not give you a wrong reading. It gives you a different circuit, and then a perfectly correct reading of that.Open this lesson
Back to all three sciences this half term The whole KS3 Physics course