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Summary Revision Notes: AQA GCSE Combined Science, Physics Paper One and Two £5.49   Add to cart

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Summary Revision Notes: AQA GCSE Combined Science, Physics Paper One and Two

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A detailed summary of all modules of the AQA course specification booklet for Physics (combined science, trilogy), with all the important information. These are the revision notes I used to achieve a 9-9 grade for my combined science GCSE.

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  • June 26, 2024
  • 17
  • 2020/2021
  • Summary
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Physics Revision
Energy
Work Done
 Work is done on an object when a force causes it to
move.
 Energy transferred is equal to work done.

Gravitational Potential Energy
 It is the energy that occurs when an object s lifted off the ground. The higher the
object, the greater the gravitational potential energy.
 The energy is measured in joules, the mass is measures in kg, gravitational field
strength is measured in N/kg, and height is measured in meters.




Kinetic Energy
 It is the energy that a moving object has.
 Energy is measured in joules, mass is measured in kg, and velocity is measured in
m/s.




Elastic Potential Energy
 Energy is measured in joules, the spring constant is measured in N/m, and the
extension is measured in meters.




Energy
 This is the amount of energy transferred over a given time.

,  The equation can also be written as work done equals power times time.




Efficiency
 This answer is written as a percentage or as a decimal.




Specific Heat Capacity
 The specific heat capacity is the amount of energy required to raise the temperature
of a 1kg object by 1 degree.
 The energy supplied is equal to the specific heat capacity (j/kg/degrees) times mass
(kg) times change in temperature (degrees).
 If the SHC is low, the material will heat up quickly.
 If the SHC is high, the material will heat up slowly.



Thermal Conductivity
 Conduction is how heat travels through a solid.
 A conductor is a material (metal – copper) that lets heat pass through easily.
 An insulator is a material (wool, wood, rubber) that doesn’t allow heat energy
through easily.
 Thermal conductivity is the rate of heat energy transferred.
 Something with high thermal conductivity transfers more heat per second through
conduction.



Electricity
Key Terms
 Potential difference is sometimes called voltage. It is the energy supplied by the
battery. It is measured in volts (V).
 Current is the rate of flow of charge, flowing from positive to negative. It is measured
in amperes – amps (A).
 Resistance opposes the flow of charges and is measured un ohms.

, Current
 Current (A) is equal to charge (coulombs) divided by time (s).
 It is the rate of flow of charge.

Potential Difference
 Potential difference (V) is equal to energy (J) divided by charge (coulombs).
 It is the amount of energy supplied.

Resistance
 Resistance (ohms) is equal to the voltage (V) divided by the current (A).
 Resistance is anything that opposes the flow of charge.
 OHMS LAW – the relationship between voltage, current and resistance.
 The greater the resistance, the smaller the current for a constant potential
difference.

Series Circuits
 A series circuit only has one route for the current to flow, as the components are
arranged one after the other.
 In a series circuit, the current stays the same (As = A1 = A2), but the potential
difference (V) splits between the components (Vs = V1 +V2).
 The total resistance is calculated by adding the resistance of all the components
together (Rt = R1 + R2 + …).
 The value of the potential difference depends on the resistance.
 The total resistance increases.

Parallel Circuits
 A parallel circuit has multiple routes for the current (I) to flow, as the components
are arranged in branches.
 In a parallel circuit, the current splits between each branch (As = A1 + A2), but the
potential difference (V) stays the same (Vs = V1 = V2).
 The amount of current in each branch depends on the resistance of the components.
 The total resistance decreases.

Short Circuits
 A short circuit is a low resistance connection between two sections of an electrical
circuit.
 This allows current to flow along the unintended path.
 It can be used to bypass a component.
 In an appliance, if the live wire touches the neutral wire, it creates a short circuit.
This allows a very large current to pass between the wires.

Domestic Electricity

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