SP3 - Energy Flashcards
What are 3 different types of energy?
Kinetic, heat, chemical potential, electrical, nuclear, light, elastic, sound, gravitational potential
What are the rules in ‘The Law of Conservation of Energy’?
Energy is never created or destroyed and energy is changed from one form into another.
What are Sankey diagrams used to show?
Efficency (useful energy divided by total energy multiplied by 100)
How are Sankey diagrams laid out?
Two arrows, one for useful energy and one for unuseful energy
What is an example of ‘wasted’ energy?
Heat or sound energy
What is the equation for G.P.E? (Gravitational Potential Energy)
P.E. = mgh
What is P.E. measured in? (Potential energy)
J (joules)
What is M measured in? (Mass)
k.g. (kilograms)
What is the amount of G? (Gravity)
10 on Earth
What is H measured in? (Height)
m (meters)
What is the equation for K.E.? (Kinetic energy)
K.E. = 1/2mv²
How do you calculate velocity? (Difficult question!)
v²=G.P.E./m 1/2
Velocity² equals kinetic energy divided by mass times by half) *(Squared root v² for v
State 4 renewable energy sources
Wind, solar, tidal, geothermal, hydro-electric, biomass
What is used to most renewable energy resources to power a generator?
A turbine
What is the dynamo effect? (the motor effect)
The dynamo effect is when electricity is created when a magnet moves/spins inside of a coil
What is one example of the dynamo effect?
A dynamo bike light
What is the definition convection?
The movement of a denser (cold) substance downwards while the less dense (hot) substance rises, causing a current to form
What is the definition of conduction?
The process of which heat energy transfers into a medium, causing the atoms within the object to vibrate and transform into kinetic energy
What is the definition of radiation?
The emission of energy from an object (usually heat energy)
What is an example of conduction?
Heating a frying pan
What is an example of convection?
A radiator heating a room
What is an example of radiation?
Heat from a lightbulb
