Home > Science > AQA Science Topics (Pre-2011) > Energy and Electricity > Heat transfer and efficiency
Energy and Electricity
What substances can convection happen in?
In solids and gases
In solids and liquids
In liquids and gases
What type of radiation do all hot objects emit?
What are the best absorbers of thermal radiation?
Light, dull surfaces
Black, shiny surfaces
Black, dull surfaces
What are the worst emitters of thermal radiation?
Light, shiny surfaces
How does heat pass through a single pane of window glass?
By conduction and convection
By conduction and radiation
By convection and radiation
What is the useful energy transfer in a radio?
Electrical to sound
Electrical to light
Electrical to heat
What form of energy is stored in a battery?
An electric lamp is 25% efficient. If it receives 100 J per second of electrical energy, how much of this is transferred as light energy?