What to expect
In this section you will learn about the big ideas of charge, a property that interacts with electric fields, electricity, the movement of charges in response to a force within a conductor, and magnetism, the forces exerted on magnetic domains or moving charges.
After studying this topic, you should be able to:
- State what an electric field is and its effect on charges
- Discuss what affects the size of an electric force
- Suggest uses for charges moving around a circuit
- Define terms like 'current', 'voltage', 'resistance' and 'power'
- Explain how magnets (permanent and temporary) are formed
- Describe how circuits and charges interact with magnets
To understand electrical currents, we must first understand what an electric current consists of and what makes it 'go'.
In an electrical circuit, electrons move due to potential difference. Electric fields caused by charged plates, point charges or charged spheres cause lone charges to accelerate. This changes their energy.
Electric circuits need not be a source of worry. There are a lot of key words, but these can be defined and learned. There are a lot of possible arrangements, but these can be simplified. There appear to be several equations, but they all emerge from a few
There are many questions you can expect to answer after studying Magnetism!
Electromagnetic induction is the process by which kinetic energy is converted into electrical energy in the presence of a magnetic field.