English National Curriculum - Science
Mission Objectives
Explain how the effect of an alternating current in one coil in inducing a current in another is used in transformers
Explain how the ratio of the potential differences across the two coils depends on the ratio of the number of turns on each coil
Calculate the current drawn from the input supply to provide a particular power output
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Words and meanings to learn
current
the flow of electric charge around a circuit, measured in amperes (A)
magnetic field
the region around a magnet or a current-carrying wire where magnetic forces can be detected
transformer
a device that changes the size of an alternating potential difference using two coils of wire (primary and secondary) wrapped around an iron core
induced potential difference
the voltage generated across a conductor when it moves through a magnetic field or when the magnetic field around it changes
National Grid
the system of cables and transformers used to transfer electrical power from power stations to homes and industries across the country
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