energy types
calculations
energy transfer
definitions
what am I ?
riddles
100
what energy is present in something moving
kinetic
100
What is the unit of energy
joules
100
what is the energy transfer in a toaster?
electrical -> heat
100
what is heat energy?
energy that moves from hot to cold object
100
WHAT DEVICE CONVERTS ELECTRICAL ENERGY INTO USEFULL SOUND .
plug in radio
loudspeaker
100
I’m everywhere, yet hard to see,
I power your lights and your TV.
I can flow or stay in place,
What am I in this endless race?
electrical
200
what type of energy does a piece of wood have?
chemical
200
if input energy is 100J what is the total output energy?
100J
200
what is the energy transfer in a solar panel?
light -> electrical
200
what is magnetic energy
energy contained in fields around the magnet
200
which device converts gravitational potential to kinetic
lift, parachute
200
I travel from the Sun to Earth,
Without me, life would lose its mirth.
I warm your skin and help plants grow,
What am I? Do you know?
light
300
Give the definition of light energy
energy given out by a luminous object
300
if input energy is 100J and useful output is 70J what is hat is the wasted output energy?
30j
300
What is the energy transfer in mobile phone?
chemical -> electrical-> heat+ light + sound
300
What is meant by useful and wasted output energy?
usefull = desired form of energy a device produced
wasted = undesired form of energy a device produced
300
the device which converts kinetic energy to electrical energy is called
dynamo
300
I measure work, though I’m not a man,
From force and distance, my value began.
I’m small in name, but power I hold,
In physics’ tongue, my story is told.
What am I?
joule
400
Give the definition of sound energy
vibrating particles in a medium that travels as waves
400
A toaster used 500J of energy to brown bread from an input of 750J. What is it's efficiency to 1 decimal place in %
66.7
400
what are all the energy transfer from a wind up car?
Winding: Mechanical (hand) → Elastic Potential. Released: Elastic Potential → Kinetic (movement) + Heat + Sound.
400
What does pwoer mean?
The rate at which energy is transferred or converted from one form to another,
400
What has an energy transfer in a continuous shift between gravitational potential energy kinetic energy?
rollercoaster
400
I’m the reason stars keep burning bright,
Yet I’m not heat, nor simple light.
I bind the smallest parts you see,
Release me, and great power will be.
nuclear
500
Three examples of objects with elastic potential energy
eg stretched rubber band, a compressed spring, and a bent bow
500
The input energy for a hairdryer is 1600J of energy, 80OJ is given out as heat, 500J as kinetic and 300J as sound. What is it's efficiency to 1 decimal place in %
81.3
500
what are all the energy transfer from a hydroelectric dam?
gravitational potential ->kinetic .
This kinetic ->electrical
500
what is the conservation of energy?
energy cannot be created or destroyed, only transformed from one form to another,
500
What transfers chemical energy into heat, chemical and kinetic.
living organism
500
I’m stored in fields, unseen yet strong,
I shape the path of what moves along.
I’m not mass, but I can bend space,
What am I in this hidden place?
gravitational potential