Energy Resources Part 2- Year 9

Question 1

What is the National Grid System?

Answer 1

A system of transmission cables and transformers

Question 2

What does the National Grid System do?

Answer 2

They transfer electrical power from the power station to where it is needed

Question 3

What is the purpose of step-up transformers?

Answer 3

Increase the voltage as electricity flows through

Question 4

What is the purpose of a step-down transformer?

Answer 4

Decrease the potential difference to make it safe

Question 5

How is electricity transferred?

Answer 5

Via a low current, but a high voltage so less energy is lost

Question 6

What is the equation for energy transferred (joules)?

Answer 6

Power x Time
Watts Seconds

Question 7

What is the equation for energy transferred (kilowatt-hours)

Answer 7

Power x Time
Kilowatt Hours

Question 8

What is the equation for cost?

Answer 8

Energy transferred x Price per kWh

Question 9

What is current measured in?

Answer 9

Amps (A)

Question 10

What is potential difference measured in?

Answer 10

Volts (V)

Question 11

What is resistance measured in?

Answer 11

Ohms (Ω)