HSC · Year 11 · Physics · Electricity and magnetism live from the app

Charging by friction, conduction and induction

Objects become charged when electrons move; the protons stay locked in their nuclei. Rubbing two different materials together drags electrons from the one that holds them loosely onto the one that holds them tightly. Touching a charged conductor to a neutral one lets the extra electrons spread over both, while simply bringing a charged rod near a conductor pushes its electrons to the far side, so earthing that side leaves it with the opposite charge. This is the real knowscape from knowhere, not a picture of one. Drag it. Watch what actually changes.

physics · electricity and magnetism · charging by friction, conduction and inductiondrag it · it is yours
in the wild

Electricity works like a sushi train.

Every part of this topic is charge doing one of three things. Sitting still, it makes an electric field. Flowing, it is a current carrying energy: voltage is joules per coulomb, current is coulombs per second. Moving, it makes a magnetic field. Same charge, three behaviours.

The belt is off. Every plate waits at the kitchen, ready to be loaded with food.

The belt starts. Each plate is loaded at the kitchen and carries food round to your seat.

Empty plates roll back for more. The food gets eaten; the plates are never used up.

what you leave with

five things, not forty.

what's underneath

nothing here is a standalone fact.

knowhere maps every concept to what it rests on and what rests on it — 1 underneath this one, 1 built on top. Each one says why, in a sentence, not as an arrow on a diagram.

this conceptcharging by friction, conduction and inductionFour benches of static: rub polythene on wool, touch a charged metal sphere to a neutral one, bring a charged rod near an earthed sphere, and build a thundercloud over the ground.
sits under itelectric fields and coulomb's lawbecause Like charges repel and unlike attract: that push and pull is what shifts electrons in every method.
built on itcurrent as flowing chargebecause Students need charge, the coulomb and free electrons in conductors before they can count charge flowing.
the rest of electricity and magnetism

8 more, same treatment.

Each one is its own knowscape in the app — built for how a particular student takes things in, not one explanation handed to everybody.

a charge speeding up between charged platesin the appvoltage as energy per chargein the appcurrent as flowing chargein the appohm's law and resistancein the appelectrical power and energy in circuitsin the appseries and parallel circuitsin the appreading magnetic field linesin the appwhat makes an electromagnet strongerin the app
this is one of 865

they don't read it. they run it.

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knowhere›hsc physics year 11›charging by friction, conduction and induction