Energy Unit Quiz

A copper block is placed into an immersion heater. Energy is transferred through the copper block. What is the name of the process by which this energy is transferred?

How is heat transferred through a liquid or gas?

How is heat transferred through a vacuum?

A person buys an oven. The inside and outside surfaces of the oven are light coloured and shiny. Explain why.

Heat is lost from our homes in many ways. How can we prevent this loss of heat?

We know how good an insulator is based on its 'u-value'. Does a good insulator have a high or a low u-value?

Energy cannot be created or destroyed, it is transferred from one form to another. When a child goes down a slide, what is the energy transfer that is occurring?

Not all of an objects is transferred usefully. Some energy is wasted as it is transferred to the surroundings. When the child go does down the slide, some energy is wasted. What form is the wasted energy?

Knowing the amount of useful and wasted energy of a system can allow you to calculate the efficiency of that system. What is the equation for efficiency?

Some energy sources are classed as non-renewable. Tick all non-renewable sources.

Fossil fuels are bad for the environment as their use contributes to global warming. A better alternative is to use nuclear power stations for generating our electricity. Why?

An object of mass 10kg is moving at a speed of 5 m/s. How much kinetic energy does the object have?

An object of mass 10 kg is raised to a height of 50 m. How much gravitational potential energy does the object have? (g=9.8 N/kg)

A microwave has a power rating of 1200W. How many joules of energy is transferred if the microwave is used for 1 second on full power?

The same microwave is used for 5 minutes to warm up a leftover meal. How much energy has been transferred by that same microwave?

Using joules to calculate energy in this way means the numbers can get quite big. Energy suppliers like to use a different unit to make the numbers a bit easier to manage. This is called the kilowatt-hour (kWh). A washing machine has a power rating of 2000W, how much energy has it used if it completes a 1 hour cycle?

A family household receives their energy bill and they are told they have used 1234 kWh of energy in one month. If one unit costs 34p, how much was their monthly bill?