Transformers

Question 1

The relative number of turns in the primary coil determines the … For the secondary coil.

Answer 1

Voltage, (this is compared the the number of turns).

Question 2

Step up transformers have … Turns on the secondary coil.

Answer 2

More.

Question 3

Step down transformers have … Turns on the secondary coil.

Answer 3

Less.

Question 4

Step up transformers … The voltage.

Step down transformers … The voltage.

Answer 4

Induce a greater voltage, induce a smaller voltage.

Question 5

Why don’t transformers work with DC?

Answer 5

DC doesn’t have an alternating current so the magnetic field doesn’t change and a voltage isn’t induced across the secondary coil.

Question 6

What is the transformer equation?

Answer 6

Voltage one / voltage two = number of turns one / number of turns two

Question 7

How do transformers change the voltage ?

Answer 7

EM induction.
An alternating voltage is connected in the primary coil of a transformer.
The alternating current in the primary coil causes the magnetic field to change constantly, inducing a voltage in the secondary coil at the same frequency as the current in the primary coil. The alternating current can flow in a circuit connected to a secondary coil.

Question 8

How is a transformer set up?

Answer 8

An iron core with two coils of wire wound around it.

Question 9

How do transformers work?

Answer 9

1. An alternating voltage is connected to the primary coil.
2. Alternating current flows in the primary coil.
3. This causes a rapidly changing magnetic field in the core.
4. Alternating voltage is induced in the secondary coil.
5. Current flows in the secondary coil.

Question 10

What does the voltage need to be generated ?

Answer 10

An alternating magnetic field!!