# Physics Paper 2 PART 1

What does the resistance of a thermistor depend on?
The resistance of a thermistor depends on its temperature. The higher the temperature, the lower the resistance.
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When a current flows in a circuit, what effect does it have?
It has a heating effect.
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What is the heating effect of a current passing through a resistor useful for?
The heating effect of a current passing through a resistor useful for: heating water in a kettle,radiant heaters,toasters,grills,ovens and underfloor heating.
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What is the formula to calculate energy?
energy transferred=current x potential difference x time.
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What is the first formula to calculate power?
electrical power=current x potential difference.
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What is the second formula to calculate power?
power=energy transferred/time taken.
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What is the third formula to calculate power?
electrical power=current squared x resistance.
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How can circuits be operated?
Circuits can be operated using alternating current or direct current.
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What is an electric current in a wire?
An electric current in a wire is a flow of electrons.
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What are the three wires in a mains plug?
Earth wire, neutral wire, live wire.
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What can certain materials become when they are magnetised?
they can become permanent or temporary magnets.
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How do you plot a compass and what is it used for?
A plotting compass is used to plot the shape and direction of magnetic lines of force. You can do this by laying a bar magnet on a piece of paper.
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What will an electric current create?
An electric current will create a magnetic field.
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What do the magnetic field lines of the individual coils in a solenoid add up to give?
They add up to give a very strong, uniform field along the centre of the solenoid.
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What does a permanent magnet have?
A permanent magnet has poles which are N and S all of the time.
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How can a temporary magnet be magnetised?
A temporary magnet can be magnetised by bringing a permanent magnet near to it.
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What happens when the permanent magnet is removed?
When the permanent magnet is removed, the temporary magnet loses its magnetism.
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What can transformers be used for?
Transformers can be used to change the size of an alternating voltage or current.
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What can a transformer be used to change?
A transformer can be used to change the potential difference of an alternating electricity supply.
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What are the three states of matter?
Solid,liquid,gas.
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What type of changes are changes of state?
Physical changes rather than chemical changes and they can be reversed.
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What is the density of a material?
The density of a material is a measure of the amount of matter that it contains per unit volume.
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What will changing the amount of material change?
Changing the amount of material will change both its mass and its volume.
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What is specific heat capacity?
Specific heat capacity is the thermal energy that must be transferred to change the temp of 1kg of a material by 1 degrees celsius.
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What is specific latent heat?
Specific latent heat is the energy that must be transferred to change 1kg of a material.
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How can the pressure of a gas be explained?
The pressure of a gas can be explained in terms of the motion of its particle.
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What happens as a gas is cooled?
As a gas is cooled the average speed of its particles falls and its volume gets smaller.
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What does gas pressure depend on?
Gas pressure depends on the motion of the particles in the gas.
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What is the distortion of a material described as?
The distortion of a material may be described as being elastic or inelastic and requires more than one force.
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What does bending require?
Bending requires two forces, one acting clockwise and one acting anticlockwise.
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What does stretching require?
Stretching requires two forces of tension, acting away from each other.
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What does compression involve?
Compression involves two equal forces acting towards one another
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What does elastic distortion mean?
Elastic distortion means that a material will return to its original shape when the deforming force is removed.
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What does inelastic distortion mean?
Inelastic distortion means that a material will not return to its original shape when the deforming force is removed.
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Forces can lead to the distortion of elastic objects, resulting in energy being stored.
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## Other cards in this set

### Card 2

#### Front

When a current flows in a circuit, what effect does it have?

#### Back

It has a heating effect.

### Card 3

#### Front

What is the heating effect of a current passing through a resistor useful for?

### Card 4

#### Front

What is the formula to calculate energy?

### Card 5

#### Front

What is the first formula to calculate power?