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Transcript
Magnetism 4 Electricity and Magnetism Related Hans Christian Oersted Discovered that an electric current causes a magnetic field How? Connected a series circuit and turned on the power. A nearby compass moved! This Proved there was an electromagnetism link Michael Faraday Discovered that a magnetic field causes an electrical current. How? Moved a wire through the magnetic field of a strong magnet. Found that an electric current was produced in the wire. Electromagnet Temporary magnet made by wrapping a current carrying wire around an iron core. More power More coils = ____________ More power More current = ____________ Galvanometer Moving coil electric current detector. The amount of deflection of a needle attached to the coil is proportional to the current passing through the coil. Galvanometer The accuracy of moving coil meters is dependent upon.…. Having a uniform and constant magnetic field
