Sustainability
What is sustainability?
Using resources so they don’t run out for future generations
What is the unit for energy?
Joule (J)
What is current?
Flow of electric charge
Name the three subatomic particles
Proton, neutron, electron
What is the formula for work?
W = F × d
Give one reason Earth can support life.
e.g. liquid water / oxygen / suitable temperature
Name one type of potential energy
gravitational / chemical / elastic
What is voltage?
Energy per charge / “push” of electrons
What is atomic number?
Number of protons
What is the formula for power?
P = W / t
What does kaitiakitanga mean?
Guardianship / caring for the environment
What does it mean that energy is conserved?
It cannot be created or destroyed, only transferred/transformed
What is the difference between series and parallel circuits?
Series = one path, parallel = multiple paths
What is mass number?
Protons + neutrons
Calculate: F = 10 N, d = 5 m
50 J
Give one action you can take to be more sustainable AND explain why
e.g. use less electricity → reduces resource use and pollution
Give an example of energy changing forms
electrical → light + heat
Why do bulbs get dimmer in a series circuit?
Energy/voltage is shared between bulbs
What is an ion?
A charged atom
Calculate: W = 200 J, t = 10 s
20 W
Explain why overusing natural resources is a problem
Resources can run out and ecosystems can be damaged
Explain the difference between renewable and non-renewable energy.
Renewable won’t run out; non-renewable will
Why are homes wired in parallel circuits?
Devices work independently and get full voltage
Explain how an atom becomes a positive ion
It loses electrons
Calculate: V = 10 V, R = 5 Ω
2 A