TRANSFORMERS AND NATIONAL GRIDS
2 marks · EasyGive one reason why transformers are essential in the National Grid. Then, name one device in your home that works at the voltage supplied after a step-down transformer.
State one reason why transformers are used in the National Grid.
Name one device in your home that operates at mains voltage (230 V).
Work this out on paper, then compare with the answer and worked solution below. With a free account you can submit written answers for marking.
Show answer
(a) To allow efficient transmission of electrical energy by reducing energy loss/heat loss in wires.
(b) Kettle / hairdryer / washing machine / television (any valid household appliance).
Show mark scheme and worked solution
Marking points
B1 (a) · 1 mark · Gives a valid reason for using transformers, such as efficient transmission or reducing energy losses.
B2 (b) · 1 mark · Names a valid device that uses 230 V mains (e.g., kettle, TV, toaster, fridge).
Worked solution
a) Transformers are used to reduce energy losses during electricity transmission. b) Answer could be: kettle, washing machine, or television.