90937 and 90941 Electricity and Magnetism
In this course you'll learn how static electricity, direct current electricity and electromagnetism work.
90937 and 90941 Electricity and magnetism
This course has three sections.
Here's a summary of what we'll be covering in each section:
In this section you'll find out why your hair stands up when you jump up and down on a trampoline, and why touching a door handle gives you a shock after you walk across a carpet. You'll have a better understanding of how lightning works, and how electrostatic charge can be used to paint metal objects, to spray large fields of crops, and to charge objects by friction or by contact. You'll also learn how our knowledge of static electricity can be used to protect us in situations where static charge can be dangerous.
DC stands for 'direct current', and in this section we focus on electricity that moves through conducting wires and is converted into other forms of energy to power the lights in your house, heaters, and other appliances.
We'll review the basics of series and parallel circuits that you learned about in junior science, then we'll build on this to introduce you to current, voltage, resistance, power, energy and time. You'll learn to build simple circuits with components wired in series or parallel, to do calculations based on them, and to apply this to solve real world problems.
Magnetism and electromagnetism
In this final section we start by looking at permanent magnets, going over the basics of magnetic forces and fields and how they work in a bar magnet. Then we look at how the whole Earth is a permanent magnet too, and how it has magnetic properties that are similar to those of a bar magnet in some ways.
Then we combine our knowledge of electricity and magnetism to show how straight and coiled wires can be made into magnets by running current through them. We show you how this works, and how you can change and calculate the magnetic field around straight and coiled current-carrying wires, then we look at some practical ways electromagnets are used.
By the end of this course you'll be ready to meet NCEA Level 1 Science Achievement Standards 90937: ‘Demonstrate understanding of aspects of electricity and magnetism’ (4 credits). This achievement standard is externally assessed. You'll also be prepared to complete Achievement Standard 90941: 'Investigate implications of electricity and magnetism for everyday life' (4 credits), which is internally assessed.
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Are you ready? Let’s get started.