transformers

Question 1

national grid

Answer 1

network of cables and pylons that transfer electrical power from power stations to homes

Question 2

step up transformer

Answer 2

increases V
decreases I
causing less power loss in the form of heat due to current heating up the high R cables

Question 3

step down transformer

Answer 3

decreases V
increases I
to safe levels for household use

Question 4

turns :voltage

Answer 4

the ratio of turns on the secondary coil to the primary coil determines how much V transforms by

Question 5

transformers efficiency

Answer 5

SUPER efficient but loose some energy as HEAT when currents heat the could or currents are induced in the iron coil not the secondary coil

Question 6

how transformers work

Answer 6

ONLY AC
the ac in the primary coil makes a changing magnetic field
this flows through the iron core into the secondary coil
the secondary coil cuts the changing magnetic field
this induces a voltage
(size depends on no. turns)