Physics 101 Flashcards
Gravitational Potential Energy
g.p.e = mass x acceleration due to gravity x height
Kinetic Potential Energy
1/2 x mass x velocity (squared)
Work Done
Work Done = force x distance
Thermal Energy Transferred
t.e.t = mass x specific heat capacity x temperature change
Electronical Energy Transferred
E = current x potential difference x time
Efficiency Equation
Useful output energy transfer % Total input energy transfer
Gradient Equation
Gradient = change in height / change in base
Resistance Equation
Resistance = voltage / current
Current Equation
Current = Charge / Time
Voltage Equation
Voltage = Energy / Charge
Power Equation
Power = Voltage x Current
The Vaporisation Equation
Energy = mass x the latent heat of fusion
Density Equation
Density = mass / volume
Pressure Equation
Pressure = Force / Area
How do Wind Turbines produce energy?
They convert Kinetic energy from moving air, and this rotation causes an electrical current to flow from a generator
Disadvantages of Fossil Fuels
Non-renewable and will run out
Has a massive effect on Greenhouse Gases
Hard to store natural gases
Disadvantages of Nuclear Power
Supplies large amounts of electricity
Non-renewable resource
Air Pollution
Decommissioning costs A LOT.
Advantages of Wind Power
Renewable
England is a very windy country
Succeeds 15% now
Can be built on land and sea
Static Electricity can be defined…
It is a charge (electrons) which is unable to flow from a substance, and essentially produces a build-up of charge.
How is a transfer of an electron achieved?
It is usually achieved by a process of friction, whereby the electron is removed from a insulator to another.
How is current defined as?
It is defined as the rate of flow of charge (electrons)
What are the calculations within a Series Circuit?
Current(1) = Current(2) = Current(3) Voltage(1) = Voltage(2) + Voltage(3)
What are the calculations within a Parallel Circuit?
Current(1) = Current(2) + Current(3) Voltage(1) = Voltage(2) = Voltage(3)
What happens when the resistance increases?
The current begins to decrease which means the flow of charge is reduced.
