Electricity and Electromagnetism

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infoWhy this? Electricity and magnetism underpin many technologies and require precise understanding for safe, effective use. Constructing circuits, measuring current and potential difference, calculating resistance, and investigating magnetic fields show how electrical and magnetic effects can be represented, tested, and applied.

scheduleWhy now? This unit extends primary experience of simple circuits and magnets by introducing standard symbols, series measurements, resistance, static charge, and induced magnetism. Its practical and quantitative treatment lays foundations for later study of electrical power and energy transfer.

Objects can become charged by the transfer of electrons, typically through friction (charging by friction), conduction, or induction.
Like charges repel and unlike charges attract.
The standard circuit symbols for components include cell, battery, switch (open and closed), lamp (bulb), ammeter, voltmeter, resistor, variable resistor, diode, LED, fuse, and motor.
Current in a series circuit is the same at all points.
An ammeter is used to measure electric current and must be connected in series with the component.
Potential difference (voltage) is measured using a voltmeter, which must be connected in parallel across the component.
Ohm's law states that the resistance (R) of a component is equal to the potential difference (V) across it divided by the current (I) through it: `R = V/I`.
Resistance is measured in ohms (Ω).
Magnetic field lines show the direction and strength of a magnetic field; they go from the north pole to the south pole outside a magnet.
The density of magnetic field lines indicates the strength of the magnetic field.
Magnetism can be induced in some materials, such as iron, nickel, and cobalt, by placing them in a magnetic field.
Induced magnets lose their magnetism when removed from the magnetic field.

rocket_launchYou must be able to

Draw and identify standard circuit symbols for electrical components.
Set up a series circuit and correctly connect an ammeter in series to measure current.
Set up a series circuit and correctly connect a voltmeter in parallel to measure potential difference across a component.
Use measurements of current and potential difference to calculate resistance using Ohm's law (`R = V/I`).
Represent magnetic fields around magnets using field lines, including the direction from north to south.
Induce magnetism in a suitable material by placing it in contact with, or near, a permanent magnet and test for induced magnetism.
Explain experimental observations and link them to a scientific hypothesis, using evidence from measurements and established scientific principles.

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