energy and workdone Flashcards
what is work done
work is done whenever a force produces a movement
what is the other name for work done
energy transfer
what is the formula for work done
w=f x d (workdone= force x distance)
what is the si unit of workdone/energy (idk ;-;)
Joules (J) 1KG=1,000J 1MJ=1,000,000J
what is energy
it is the ability to do work
what is the si unit for energy
Joules (J)
what is kinetic energy
it is the energy due to motion, all moving objects have kinetic energy
what is potential energy
it is the energy of an object because of its position, shape or state
what is thermal energy( heat energy)
energy traveling from a hotter object to a cooler object
what is radiated energy
waves carry the energy of light and sound (both travel in forms of waves) sun radiates light energy and loudspeakers radiate sound energy/ it is the energy carried out in electromagnetic waves
what is nuclear potential energy
the energy in the nucleus of an atom
chemical potential energy
the energy released by chemical reactions
what is gravitational potential energy
the energy gained by the object due to its work done against gravity
elastic potential energy
energy stored in an object by which it can regain its original shape and size when the deforming force is removed
what is the formula for kinetic energy
ke=1/2mv2 (kinetic energy= 0.5 x mass x velocity 2
what is the formula for potential energy
mgh (mass x gravitity x height)
what is power
it is the rate of doing work/energy transfer
what is the formula for power
p=wd/t (power= workdone/ time)
what is the si unit for power
Watts or J/s
what is efficiency
it is the ratio of output over input
what is the formula for efficiency
e= useful output/ total input x 100
how do you find the input
wastage+ output
what are the formulas important for energy
1- wd= f x d 2- p= wd/t 3- efficiency= useful output/ total input x 100 4-ke=1/2mv2 5-pe=mgh
what 2 groups are energy sources classified into
renewable energy sources and non-renewable energy sources
what are renewable resources
are energy sources that can be replenished over a short period of time
what are non-renewable resources
energy sources that cannot be replenished over a short period of time
what are the conversion diagram and block diagram solar energy
conversion diagram
heat energy –> electrical energy
block diagram
solar panel –> transformer
what are the advantages and disadvantages of the solar energy
advantages: renewable and pollution-free
disadvantages: not available all time and produces small electricity
what is the conversion diagram and block diagram of wind energy?
conversion diagram
the kinetic energy of wind—> mechanical energy of turbine and generator—>electrical energy
block diagram
turbine—> generator—>transformer
what are the advantages and disadvantages of wind energy
advantages: renewable and pollution free
disadvantages: it occupies a lot of space and is noisy and its not available all the time
what is the conversion diagram and block diagram of geothermal energy
conversion diagram
heat energy from magma–>kinetic energy of steam
–>mechanical energy of turbine and generator–> electrical energy
block diagram
magma—> turbine—> generator— transformer
what are the advantages and disadvantages of geothermal energy
advantages: it is renewable and efficient
disadvantages: it causes pollution and is expensive
what is the conversion diagram and block diagram of hydroelectric energy
conversion diagram
potential energy of water—> kinetic energy of water–> mechanical energy of turbine and generator–> electrical energy
block diagram
dam–> turbine—> generator–> transformer
what are the advantages and disadvantages of hydroelectric energy?
advantages: it is renewable and the running cost is low
disadvantages: it causes water pollution and occupies lots of space and the installation cost is high
what is the conversion diagram and block diagram of fossil fuel energy
conversion diagram
chemical energy–> heat energy—> kinetic energy of steam–> mechanical energy of the turbine and generator—> electrical energy
block diagram
fuel–>boiler–>turbine–generator–>transformer
what are the advantages and disadvantages of fossil fuel energy
advantages: are readily available and more electricity
disadvantages: it is non-renewable and causes pollution and expensive cost for fuel
what is the conversion diagram and block diagram of the nuclear power station
Conversion diagram
chemical energy–>heat energy–> kinetic energy of steam–> mechanical energy of turbine and generator–> electrical energy
Block diagram
nuclear reactor–> boiler–>turbine–>generator–> transformer
what are the advantages and disadvantages of nuclear power stations
advantages: produces large electricity
disadvantages: non-renewable, harmful for living things, wastage is also radioactive and high installation cost
what is nuclear fission
is the splitting of a heavy nucleus into two
lighter nuclei,and releases more neutrons
what is nuclear fusion
Nuclear fusion is the combining of two lighter nuclei to
form a heavier nucleus, and releasing one neutron
