mainly electrucity

Question 1

Friction

Answer 1

surfaces rub together, so there is a movement of electrons which have negative charge and the object becomes negatively charged because it gains electrons

Question 2

The student lets go of the end of the tape and the charges cause it to move towards the roll

Answer 2

opposite charges attract

Question 3

Why is eltrical energy transmitted using very high voltages

Answer 3

high voltage leads to low current equation and less heat loss so it would be more efficient

Question 4

Why dc generators have to chnage rather than ac

Answer 4

transformers change the voltage, transforms use alternating current

Question 5

Some wind farms are in remote areas explain how he electrical energy from a remote wind farm is transmitted to large cities

Answer 5

tep up transformer used at the wind farm - little energy is wasted during transmission - step down transformer at other end

Question 6

What does 30w tell you about energy transfer

Answer 6

power rating and rate of energy transferred

Question 7

Explain how an earth connection protects the user

Answer 7

in case of a fault the outer metal casing of the soldering iron becomes live there is a low resistance part for the current to go to the earth stopping the live eltrcity going to earth through user