Electromagnetic induction and transformers

Question 1 of 10

A transformer with 200 primary turns steps 240 V down to 24 V. The number of secondary turns is ___.

Question 2 of 10

A transformer with 400 primary turns steps 240 V down to 48 V. The number of secondary turns is ___.

Question 3 of 10

Electromagnetic induction is

Question 4 of 10

A transformer with 400 primary turns steps 240 V down to 24 V. The number of secondary turns is ___.

Question 5 of 10

A transformer with 500 primary turns steps 240 V down to 120 V. The number of secondary turns is ___.

Question 6 of 10

Moving a magnet into a coil induces a current.

Question 7 of 10

A transformer has 500 primary turns and 100 secondary turns. If the primary voltage is 11,000 V, find the secondary voltage.

Question 8 of 10

Lenz's law states that the induced current flows in a direction to

Question 9 of 10

Transformers can step up direct current.

Question 10 of 10

Explain why electrical power is transmitted at high voltage. A power station sends 100 kW through cables of total resistance 5 Ω. Compare the power loss when transmitted at (a) 1,000 V, (b) 20,000 V.