A transformer has turns on its primary coil and turns on its secondary. The primary voltage is V. Calculate the secondary voltage.
Salam Academy Original Practice · Proposed mark scheme
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12 questions
A step-up transformer has
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A transformer will not work with a steady d.c. supply because
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Electricity is transmitted at very high voltage because
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A step-up transformer has a turns ratio . The input is kV. Calculate the output in kV.
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The core of a transformer is made of
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A transformer works because
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A transformer changes V to V. Its primary has turns. Calculate the number of turns on the secondary.
Salam Academy Original Practice · Proposed mark scheme
An ideal transformer has a primary current of A at V. Its secondary voltage is V. Calculate the secondary current.
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A current of A flows through transmission cables of total resistance Ω. Calculate the power lost in the cables, in kW.
Salam Academy Original Practice · Proposed mark scheme
The same power is transmitted at times the voltage. By what factor is the power lost in the cables reduced?
Salam Academy Original Practice · Proposed mark scheme
A power station transmits MW at kV through cables of resistance Ω. Calculate the percentage of the power lost in the cables.
Salam Academy Original Practice · Proposed mark scheme