IGCSE physics Transformers Turns

Which is the symbol for a transformer?

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• 10

• 25

• 50

• 100

If the primary voltage is 20V, the secondary voltage is 100V and the number of secondary turns is 20, what is the number of primary turns?

• 100

• 20

• 4

• 1

If the primary voltage is 200V, the number of primary turns is 10, the number of secondary turns is 80, what is the secondary voltage?

• 1000

• 2000

• 8000

• 1600

If the number of secondary turns is 400, the number of primary turns is 1600 and the secondary voltage is 1600, what is the primary voltage?

• 6400

• 1600

• 1000

• 100

• 25

• 50

• 100

• 500

• 2

• 5

• 25

• 100

• 250

• 225

• 200

• 4500

• 56000

• 1500

• 3500

• 10000

• 4000

• 10000

• 25000

• 62500