unit 3.2

Question 1

What are the 9 different types of energy?

Answer 1

1. Thermal
2. Light
3. sound
4. elastic
5. Gravitational
6. Kinetic
7. electrical
8. chemical
   9.nuclear

Question 2

What is energy?

Answer 2

The ability to cause change

Question 3

What is efficiency?

Answer 3

The more efficient a device is, the less energy is wasted.

Question 4

What is non-renewable energy?

Answer 4

An energy source we will eventually run out of.

Question 5

What are the 4 non-renewable energy sources?

Answer 5

-Gas
-Nuclear
-Oil
Coal

Question 6

What is renewable energy?

Answer 6

An energy source we can replace faster than we use it.

Question 7

What are the 7 renewable energy sources?

Answer 7

• solar
• wind
• wave
• tidal
• hydroelectric
• geothermal
• biofuel

Question 8

What is the national grid?

Answer 8

A network of transformers and cables.

Question 9

Why does the national grid use step up transformers?

Answer 9

To increase voltage to waste less energy.

Question 10

Why does the national grid use step down transformers?

Answer 10

To decrease voltage so it’s safer.

Question 11

How is the national grid reliable?

Answer 11

• It’s monitored 24/7
• The base load is running 24/7
• If demand is too high they resort to hydroelectric (short start up time) Or they import from france.

Question 12

How is the national grid efficient?

Answer 12

They use step up transformers to increase voltage so less energy is wasted.