Yr 7 Energy Costs Mastery

What are nonrenewable resources?

• energy sources that are replaced faster than they are used

• energy sources that can never be replaced or are replaced more slowly than they are used

• a natural product that can be changed into other forms of energy to do work

All of the following are fossil fuels EXCEPT

• oil

• water

• coal

• natural gas

What is a device that changes solar energy into electrical energy?

• wind turbine

• perpetual motion machine

• electric generator

• solar cell

All are disadvantages of using Fossil Fuels EXCEPT

• Renewable resources

• Nonrenewable resources

• risk of oil spill

• produces acid precipitation

What is the modern unit of energy?

• Calorie

• Kilocalorie

• Joule

How do you gain weight?

• Consume more energy than you expend (use).

• Expend more energy than you consume.

• Consume exactly the same energy as you expend.

A kettle has a power of 2500 W. What's the power in kW?

• 250 kW

• 2.5 kW

• 25 kW

• 0.25 kW

You do 90 joules of work in 30 seconds. How much power have you generated?

• 30 watts
• 3 watts
• 120 watts
• 270 watts

If a 4 kW oven was on for 2h cooking a joint of beef, how many units (kWh) of electrical energy were used?

• 8 kWh

• 4 kWh

• 2 kWh

• 0.5 kWh

If the oven used 8kWh of electrical energy and each kWh was 34p, calculate the cost.

• 272 p

• £272

• 2.72 p

• £27.20