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.
1 of 35
When a current flows in a circuit, what effect does it have?
It has a heating effect.
2 of 35
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.
3 of 35
What is the formula to calculate energy?
energy transferred=current x potential difference x time.
4 of 35
What is the first formula to calculate power?
electrical power=current x potential difference.
5 of 35
What is the second formula to calculate power?
power=energy transferred/time taken.
6 of 35
What is the third formula to calculate power?
electrical power=current squared x resistance.
7 of 35
How can circuits be operated?
Circuits can be operated using alternating current or direct current.
8 of 35
What is an electric current in a wire?
An electric current in a wire is a flow of electrons.
9 of 35
What are the three wires in a mains plug?
Earth wire, neutral wire, live wire.
10 of 35
What can certain materials become when they are magnetised?
they can become permanent or temporary magnets.
11 of 35
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.
12 of 35
What will an electric current create?
An electric current will create a magnetic field.
13 of 35
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.
14 of 35
What does a permanent magnet have?
A permanent magnet has poles which are N and S all of the time.
15 of 35
How can a temporary magnet be magnetised?
A temporary magnet can be magnetised by bringing a permanent magnet near to it.
16 of 35
What happens when the permanent magnet is removed?
When the permanent magnet is removed, the temporary magnet loses its magnetism.
17 of 35
What can transformers be used for?
Transformers can be used to change the size of an alternating voltage or current.
18 of 35
What can a transformer be used to change?
A transformer can be used to change the potential difference of an alternating electricity supply.
19 of 35
What are the three states of matter?
Solid,liquid,gas.
20 of 35
What type of changes are changes of state?
Physical changes rather than chemical changes and they can be reversed.
21 of 35
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.
22 of 35
What will changing the amount of material change?
Changing the amount of material will change both its mass and its volume.
23 of 35
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.
24 of 35
What is specific latent heat?
Specific latent heat is the energy that must be transferred to change 1kg of a material.
25 of 35
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.
26 of 35
What happens as a gas is cooled?
As a gas is cooled the average speed of its particles falls and its volume gets smaller.
27 of 35
What does gas pressure depend on?
Gas pressure depends on the motion of the particles in the gas.
28 of 35
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.
29 of 35
What does bending require?
Bending requires two forces, one acting clockwise and one acting anticlockwise.
30 of 35
What does stretching require?
Stretching requires two forces of tension, acting away from each other.
31 of 35
What does compression involve?
Compression involves two equal forces acting towards one another
32 of 35
What does elastic distortion mean?
Elastic distortion means that a material will return to its original shape when the deforming force is removed.
33 of 35
What does inelastic distortion mean?
Inelastic distortion means that a material will not return to its original shape when the deforming force is removed.
34 of 35
What can forces lead to?
Forces can lead to the distortion of elastic objects, resulting in energy being stored.
35 of 35
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?
Comments
No comments have yet been made