P2c

Question 1

What are step-up transformers used for?

Answer 1

-to reduce the current and increase the voltage from the generator to the grid

Question 2

What does a high current do when transmitting lots of electrical power?

Answer 2

-high currents makes cables get hot, which is inefficient as a lot of the heat goes to waste and money is wasted

Question 3

What are step-down transformers used for?

Answer 3

• to reduce the voltage to make it safe for household use

- between the grid and homes

Question 4

What is off-peak electricity?

Answer 4

• electricity supplied at night

- it is often cheaper

Question 5

What are some advantages off-peak electricity?

Answer 5

• cost-effective for electrical companies as power stations can’t be turned off at night
• cheaper for consumers to buy electricity during off-peak electricity

Question 6

What are some disadvantages of off-peak electricity?

Answer 6

• risk fire is increased with more appliances going at night bu no one is watching
• you may stop enjoying the use of electricity during to day and wait for the cheapers

Question 7

What are kilowatt-hours?

Answer 7

-the amount of electrical energy converted by 1kW appliance left on for 1 hour

Question 8

What is power rating and how does it work?

Answer 8

• power rating of an appliance depends on the voltage and current it uses
• power is measured in watts and kilowatts, W and kW