Physics
High School (9–10)
Electricity & Magnetism › Magnetic Effects of CurrentElectricity & Magnetism › Electromagnetic InductionElectricity & Magnetism › Current ElectricityChapter 9Magnetic Effects of Electric Current
A compass needle moves when you bring a wire with a current near it. A crane lifts a car with a magnet that you can switch off. A fan turns, and a power station makes electricity, with the same two ideas: a current has a magnetic field, and a magnet and a coil can make a current. In this chapter we study the field of a current, the force that a field makes on a current, the electric motor, the generator, and the safe wiring of a house. Python helps us calculate and draw.
Part of Physics · High School (9–10) (chapter 9)
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Magnets and the Magnetic Field of a Current
A compass needle always points north, but near a wire with a current it swings away. In this course we map the field of a magnet with field lines, we find that a current has a magnetic field too, and we use a coil to make an electromagnet that we can switch on and off.
Force on a Current and the Electric Motor
A fan, a washing machine and a toy car all have a motor. In this course we find that a magnetic field pushes on a wire that carries a current, we find the direction of the push with Fleming's left-hand rule, and we see how this push turns the coil of an electric motor.