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P1 - Energy (Types of Energy (Elastic potential (Elastic band), Chemical…
P1 - Energy
Types of Energy
Elastic potential
Elastic band
Chemical
Food
Gravitational Potential
Parachuting
Heat
Fire
Light
Traffic lights
Nuclear
Light bulbs
Sound
Speakers
Electric
Atom bomb
Kinetic
Movement
Equations
Kinetic Energy
KE = 1/2mv(2)
m - mass in kg
v - speed in m/s
KE - Kinetic Energy in J
Gravitational Potential Energy
GPE = mg(delta)h
m - mass in kg
g - gravitational field stength
h - height (change in height) in m
GPE - Gravitational Potential Energy in J
Efficiency
Efficiency = useful output energy transfer/input energy transfer
Efficiency = useful power out/total power in
Power
P = E/t
t - time in s
E - energy in J
P = wd/t
wd - work done in J
t - time in s
P - Power in W
Specific Heat Capacity
Energy = mc(temp. change)
C = E/m(temp. change)
m - mass in kg
(temp. change) in degrees Celsius
E - energy in J
C = Specific Heat Capacity
Key Terms/things to remember
The power rating of an appliance is defined as the 'rate of doing work'
Efficiency = measure of how much energy transferred is useful
Renewable = an energy resource which can be (or is being) replenished as it is being used
The Specific Heat Capacity is the amount of energy needed to raise the temperature of 1kg by 1 degrees Celsius