electricity - the national grid

Question 1

what does the national grid do?

Answer 1

it disputes electricity across the country

Question 2

what does increasing voltage do to the current?

Answer 2

increases the current

Question 3

what does decreasing the voltage do to the current?

Answer 3

decreases the current

Question 4

what is the national grid system - how does the electricity go around the country?

Answer 4

power station to step up transformer to a pile on to a step down transformer to the consumer

Question 5

what do transformers do?

Answer 5

change voltages and currents in transmission lines

Question 6

how is a transformer formed?

Answer 6

from two coils of wire around a magnetic core

Question 7

what does the number of coils determine?

Answer 7

determines whether the transformer steps up the voltage of steps down the voltage
if there are more turns on the secondary coil than the primary coil it is a stepup transformer
if there are more turns on the primary coil than the secondary coil it is a step down transformer

Question 8

what is a step up transformer used for?

Answer 8

to increase the voltage and reduce the current - less current means less energy is lost through heating the wire

Question 9

what does a step down voltage do?

Answer 9

makes the voltage safer

Question 10

what will the electrical current do when it flows through the wire and heat up?

Answer 10

the energy will dissipate to the surrounding

Question 11

what can you do to ensure the minimum amount of energy is lost?

Answer 11

make cables thick so that their resistance is low
make the voltages higher to reduce the current through the transmission lines