General
True or false: energy can be created
False - energy cannot be created or destroyed
True or false: A 5-star fridge uses far less electricity per year than a 2-star fridge.
What type of kinetic energy does a light bulb produce?
Light energy
What type of potential energy is stored in petrol or food or batteries?
Chemical energy
You move your leg to kick a ball. Energy transfer or transformation?
Transfer
What would have more gravitational potential energy? A 1kg coconut 5m up a tree or a 3kg coconut 5m up a tree?
3kg
A kettle uses 98% of input energy to heat the water and 2% of the energy is wasted as sound. Is this energy efficient or inefficient?
Efficient
Give an example of kinetic energy.
A ball rolling
What type of potential energy is in a stretched rubber band?
Elastic energy
You plug a lamp into the electrical socket and then turn the light on. Energy transfer or transformation?
Transformation
Energy is defined as the ability to do ____
Work
Which of the following is an example of a wasted energy output?
A)Light from a torch
B)Motion of a fan
C)Heat from a light globe
D)Sound from speakers
C
What type of kinetic energy does a speaker have?
Sound energy
Give an example of gravitational energy.
A ball being held up
Describe the heat transfer that may occur if a person is sitting by a fire.
Thermal energy from fire transfers to person, heating them up
Energy is measured in ____
Joules (J)
Shade over windows, insulation, tinted windows etc
The particles in the hot cup of tea move faster as they have more kinetic energy in the form of thermal (heat) energy
Give 3 examples of nuclear energy.
Sun, nuclear power plant, nuclear bomb
Fill in the gaps:
Solar panel: light energy -> _______ + _________
Electrical and heat
List the 9 types of energy
Kinetic, light, sound, electrical, thermal, chemical, nuclear, elastic, gravitational
Calculate the energy efficiency of the following:
A battery-operated car uses 200J of chemical energy from the battery. It converts 20J into sound energy, 30J into heat energy, and 150J into kinetic energy.
How do you work out the energy efficiency and what is the energy efficiency percentage?
(150/200) x 100 = 75%
In electrical energy, there is a flow of charged particles. What are the charged particles called? *hint: starts with the letter E
Electrons
What type of potential energy is created when you wind up a toy
Elastic potential energy
Name the input energy, useful output energy, and wasted output energy for a battery-operated toy car.
________ -> _________ + __________
chemical potential energy (battery) -> kinetic energy (useful) + heat energy (wasted) + sound energy (wasted)