Energy And Electricity Flashcards
(24 cards)
What energy is stored in the food we eat?
Chemical
How many Joules are in 1 kilojoule?
1000
What useful energy transfers take place in a moving car?
Chemical to Kinetic
What are the units for energy?
Joules
Batteries are stores of:
Chemical energy
What energy transfer is happening in a rocket at liftoff?
Chemical transferred to Kinetic and GPE
If a machine is 45% efficient, what % is wasted?
55%
Which of these can happen to energy?
Converted
The wasted energy transfers in a lightbulb are:
Electrical to thermal
Which is not an energy store?
Light energy
What type of energy is stored in a wind-up toy?
Elastic potential
What is the scientific term for ‘movement energy’?
Kinetic energy
The law of the conservation of energy states that…
Energy cannot be created or destroyed, only transferred.
A stationary object on top of a shelf is likely to have:
GPE
What energy transfers occur in wind turbines?
Kinetic to electrical
A food mixer takes in 150J of electrical energy and produces 75J of kinetic and 25J of heat, how much sound is produced?
50J
What types of energy are wasted by a vacuum?
Heat and sound
What is the energy transfer for an electric light bulb?
Electrical to heat and light
What energy is in a kettle?
Electrical to Thermal and Kinetic
What energy transfer occurs when a footballer hits the ball?
Kinetic to Kinetic
What is the wasted energy output from a TV?
Heat
The power of an appliance is the amount of ……..it uses each second.
Energy
What is it called when one type of energy transforms into another?
Energy transfer
What is the same as 80 kJ?
80,000 J
