Energy stores
A crane lifts some bricks to the roof. The bricks are now at rest. Energy has been transferred from the chemical store of the crane's fuel to which store of the bricks?
gravitational (potential) store
What are three fossil fuels?
coal, oil, natural gas
Magnetic field lines always point in which direction?
from north to south
What name is given to the coil of wire in an electromagnet?
solenoid
Dissipated energy ends up in which energy store of the surroundings?
thermal store
When they are not working, our muscles keep energy ready in which store?
chemical store
Which energy resource draws from heat inside the Earth?
geothermal
What two magnetic materials do not include iron?
cobalt and nickel
What do we call the flow of electric charge through a wire?
current
What is measured in units of kilowatt-hours?
energy
What unit is used to measure energy in the thermal store?
joules
Pappy likes to heat his home with an old-fashioned wood-burning stove. What energy resource is he using?
biomass (biofuel)
Which parts of a magnet have the strongest fields?
the poles (the ends)
In an electric bell, what do we call the two points that break the circuit when they move apart?
contacts
What unit, abbreviated kcal, is often used on food packets to give the energy content?
kilocalories
Plants take energy from the Sun and put it into the chemical store of which simple sugar molecule?
glucose
Which energy resource draws from the gravitational store of a water reservoir?
hydroelectric
outer core
In a relay switch, one circuit is the "control" circuit and the other is called what?
load circuit
What unit is equivalent to a joule per second?
watt
The energy we get from uranium fuel by nuclear fission comes from which energy store?
nuclear store
Which energy resource does NOT require a spinning turbine?
solar
Earth's magnetic field protects us from the stream of electrically charged particles known by what name?
solar wind
The core of an electromagnet is usually "soft" iron. What makes it "soft"?
it is easily magnetised (demagnetised)
The English word "petroleum" comes from two Latin words meaning "oil" and what?
rock (stone)