energy and workdone

Question 1

what is work done

Answer 1

work is done whenever a force produces a movement

Question 2

what is the other name for work done

Answer 2

energy transfer

Question 3

what is the formula for work done

Answer 3

w=f x d (workdone= force x distance)

Question 4

what is the si unit of workdone/energy (idk ;-;)

Answer 4

Joules (J) 1KG=1,000J 1MJ=1,000,000J

Question 5

what is energy

Answer 5

it is the ability to do work

Question 6

what is the si unit for energy

Answer 6

Joules (J)

Question 7

what is kinetic energy

Answer 7

it is the energy due to motion, all moving objects have kinetic energy

Question 8

what is potential energy

Answer 8

it is the energy of an object because of its position, shape or state

Question 9

what is thermal energy( heat energy)

Answer 9

energy traveling from a hotter object to a cooler object

Question 10

what is radiated energy

Answer 10

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

Question 11

what is nuclear potential energy

Answer 11

the energy in the nucleus of an atom

Question 12

chemical potential energy

Answer 12

the energy released by chemical reactions

Question 13

what is gravitational potential energy

Answer 13

the energy gained by the object due to its work done against gravity

Question 14

elastic potential energy

Answer 14

energy stored in an object by which it can regain its original shape and size when the deforming force is removed

Question 15

what is the formula for kinetic energy

Answer 15

ke=1/2mv2 (kinetic energy= 0.5 x mass x velocity 2

Question 16

what is the formula for potential energy

Answer 16

mgh (mass x gravitity x height)

Question 17

what is power

Answer 17

it is the rate of doing work/energy transfer

Question 18

what is the formula for power

Answer 18

p=wd/t (power= workdone/ time)

Question 19

what is the si unit for power

Answer 19

Watts or J/s

Question 20

what is efficiency

Answer 20

it is the ratio of output over input

Question 21

what is the formula for efficiency

Answer 21

e= useful output/ total input x 100

Question 22

how do you find the input

Answer 22

wastage+ output

Question 23

what are the formulas important for energy

Answer 23

1- wd= f x d
2- p= wd/t
3- efficiency= useful output/ total input x 100
4-ke=1/2mv2
5-pe=mgh

Question 24

what 2 groups are energy sources classified into

Answer 24

renewable energy sources and non-renewable energy sources

Question 25

what are renewable resources

Answer 25

are energy sources that can be replenished over a short period of time

Question 26

what are non-renewable resources

Answer 26

energy sources that cannot be replenished over a short period of time

Question 27

what are the conversion diagram and block diagram solar energy

Answer 27

conversion diagram
heat energy –> electrical energy

block diagram

solar panel –> transformer

Question 28

what are the advantages and disadvantages of the solar energy

Answer 28

advantages: renewable and pollution-free
disadvantages: not available all time and produces small electricity

Question 29

what is the conversion diagram and block diagram of wind energy?

Answer 29

conversion diagram
the kinetic energy of wind—> mechanical energy of turbine and generator—>electrical energy

block diagram
turbine—> generator—>transformer

Question 30

what are the advantages and disadvantages of wind energy

Answer 30

advantages: renewable and pollution free
disadvantages: it occupies a lot of space and is noisy and its not available all the time

Question 31

what is the conversion diagram and block diagram of geothermal energy

Answer 31

conversion diagram
heat energy from magma–>kinetic energy of steam
–>mechanical energy of turbine and generator–> electrical energy

block diagram
magma—> turbine—> generator— transformer

Question 32

what are the advantages and disadvantages of geothermal energy

Answer 32

advantages: it is renewable and efficient
disadvantages: it causes pollution and is expensive

Question 33

what is the conversion diagram and block diagram of hydroelectric energy

Answer 33

conversion diagram
potential energy of water—> kinetic energy of water–> mechanical energy of turbine and generator–> electrical energy

block diagram
dam–> turbine—> generator–> transformer

Question 34

what are the advantages and disadvantages of hydroelectric energy?

Answer 34

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

Question 35

what is the conversion diagram and block diagram of fossil fuel energy

Answer 35

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

Question 36

what are the advantages and disadvantages of fossil fuel energy

Answer 36

advantages: are readily available and more electricity
disadvantages: it is non-renewable and causes pollution and expensive cost for fuel

Question 37

what is the conversion diagram and block diagram of the nuclear power station

Answer 37

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

Question 38

what are the advantages and disadvantages of nuclear power stations

Answer 38

advantages: produces large electricity
disadvantages: non-renewable, harmful for living things, wastage is also radioactive and high installation cost

Question 39

what is nuclear fission

Answer 39

is the splitting of a heavy nucleus into two

lighter nuclei,and releases more neutrons

Question 40

what is nuclear fusion

Answer 40

Nuclear fusion is the combining of two lighter nuclei to

form a heavier nucleus, and releasing one neutron