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Induced potential (HT only) GapFill
Target Level
4-5
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A potential difference can be induced in a conductor by
. If this potential difference is induced in a
then a current will be induced. This is known as the
. This effect can be used in
to produce an alternating current, and in
to produce a direct current.
A transformer uses two coils around an iron core to increase or decrease a potential difference, often in the National Grid; an iron core is used because , which means that the efficiency of the transformer increases. For a transformer, , where Vp = potential difference across the primary coil, Vs = potential difference across the secondary coil, Np = number of turns in the primary coil, and Ns = number of turns in the secondary coil.
If a transformer was 100 % efficient, then .
A transformer uses two coils around an iron core to increase or decrease a potential difference, often in the National Grid; an iron core is used because , which means that the efficiency of the transformer increases. For a transformer, , where Vp = potential difference across the primary coil, Vs = potential difference across the secondary coil, Np = number of turns in the primary coil, and Ns = number of turns in the secondary coil.
If a transformer was 100 % efficient, then .