Transformer Equations (AQA GCSE Physics): Quizzes
📚Quizzes
Practise the questions
11 questions from this quiz
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Practise the questions
11 questions from this quiz
What equals the ratio of pd across primary to pd across secondary in a transformer?
What equals the ratio of pd across primary to pd across secondary in a transformer?
Ratio of coils on primary to secondary
For a 100% efficient transformer, what equation relates power in primary and secondary coils?
For a 100% efficient transformer, what equation relates power in primary and secondary coils?
At what potential difference is electricity generated at the power station?
At what potential difference is electricity generated at the power station?
25,000 V
What pd is used to transmit electricity on the National Grid?
What pd is used to transmit electricity on the National Grid?
400,000 V
By what factor does the transformer increase the pd from 25,000 V to 400,000 V?
By what factor does the transformer increase the pd from 25,000 V to 400,000 V?
16
If pd increases by factor of 16 with no energy losses, what happens to current?
If pd increases by factor of 16 with no energy losses, what happens to current?
Reduced by factor of 16
By what factor is the heating effect reduced when current is reduced by factor of 16?
By what factor is the heating effect reduced when current is reduced by factor of 16?
256
Why is heating reduced by rather than just 16?
Why is heating reduced by rather than just 16?
Which equation shows the relationship between power, pd and current?
Which equation shows the relationship between power, pd and current?
Which equation explains why heating effect depends on current squared?
Which equation explains why heating effect depends on current squared?
Why does reducing current mean energy is transferred more efficiently?
Why does reducing current mean energy is transferred more efficiently?
Less energy dissipated as heat