P4/5 Electric Currents

Question 1

Electrical resistance

Answer 1

Electrical resistance or resistance in a circuit is the opposition to the flow of charge

Question 2

Transformer?

Answer 2

Transformers are used to change the voltage and current.

Question 3

Step up transformer?

Answer 3

increase the voltage,decreases the current

Question 4

Step down transformer?

Answer 4

decreases the voltage, increases the curren

Question 5

Function of a power station

Answer 5

Burn fuel - heat water – steam –turn turbine
- turn generator – generate electricity

Question 6

Function of national grid network

Answer 6

Electricity is transported across the country by huge networks of cables.

Question 7

Problems with underground cables?

Answer 7

-Very expensive to put miles and miles of
cable underground. Lots of digging.
-Maintenance would be harder, would have
to dig them up.

Question 8

What is a fuse?

Answer 8

A fuse is a device that is used to protect devices from a current which is too high.

Question 9

What us charge measure in

Answer 9

Coulombs

Question 10

What is power meausred in

Answer 10

Watts

Question 11

What is energy transferred meaured in

Answer 11

Joules