Physics P2 (Electricity)

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What is the current of a circuit and what are its units?
It is the rate of flow of electrical charge and is measured in amperes(amps)
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What is the unit of charge flow ?
coulombs (C)
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What is the unit of time?
seconds (s)
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What is another word for voltage?
potential difference
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What does the current through a component depend on?
The voltage and resistance
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What will happen to the current if the resistance is increased?
it will decrease
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In a series circuit,what stays the same and what is shared?
current stays the same and the voltage is shared?
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In a parallel circuit, what stays the same and what is shared?
voltage stays the same and the current is shared
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What relationship is there between current and voltage in a resistor and so what can be said about the resistance?
They are directly proportional and the resistance remains the same as the current changes
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On an IV graph, if the line is shallower what does this mean in terms of resistance?
There is a higher resistance
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If the current of a filament lamp increases, what happens to the temp and resistance?
They both increase
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In what circuit component does the current in one direction?
A diode
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In the reverse direction, what is the resistance like in a diode?
Very high
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If you keep adding resistors in series, what will happen to the total resistance?
It will increase
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If you keep adding resistors in parallel, what will happen to the total resistance?
It will decrease
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As the temp increases in a thermistor, what happens to the resistance?
It decreases
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What is an application of a thermistor?
A thermostat
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As the light intensity increases in an LDR, what happens to the resistance?
It decreases
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What is an application of an LDR?
switching lights on when it gets dark
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What must be kept constant to test for the resistance of circuit components?
The temperature
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What do a.c and d.c stand for?
alternating current and direct current
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What type of current is main electricity?
a.c
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What is the voltage of mains electricity?
230V
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What is the frequency of mains electricity?
50Hz
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What is the difference between direct and alternating potential difference?
current flows in the same direction in dc and in both directions in ac
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What are the 3 wires of a three-core cable?
live, neutral and earth
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What are the colours for each wire?
live=brown, neutral=blue, earth= green and yellow stripes
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What is the function of the live wire?
To carry the alternating potential difference from the supply
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What is the function of the neutral wire?
To complete the circuit
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What is the function of the earth wire?
It is a safety wire to stop the appliance becoming live
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What is the p.d between the live and earth wire?
230V
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Which wire only carries the current when there is a fault?
The earth wire
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When a charge flows through a circuit, what is done?
Work is done
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What is the National Grid?
A system of cables and transformers linking power stations to consumers
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What are step-up transformers used to do?
To increase the voltage and decrease the current
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What are step-down transformers used to do?
To decrease the voltage and increase the current
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What makes the National Grid effficient?
The current, for most of the journey, is low meaning less wasted energy will dissipate into the surroundings such as thermal energy
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What two certain materials are rubbed against each other, what happens?
They become electrically charged
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What do these materials have to be?
Insulators
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What charged particle is rubbed off one material and onto the other?
Negatively charged electrons
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What will happen to the material that becomes negatively charged?
The material had gained electrons
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What will happen to the material that becomes positively charged?
The material lost electrons
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What is exerted when two electrically charged objects are brought close together?
A force
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What happens to two objects that carry the same type of charge?
They repel
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What happens to two objects that carry different types of charge?
They attract
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Attraction and repulstion between tow charged objects are example sof what type of force?
A non-contact force ( specially electrostatic)
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What does a charge object create around itself?
An electric field
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What happens to the field when the it is further away from the charged object?
It becomes weaker
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What does a second charged object experience if it is placed in the field?
A force
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What happens to the force as the distance between the objects decreases??
It gets stronger (increases)
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Other cards in this set

Card 2

Front

What is the unit of charge flow ?

Back

coulombs (C)

Card 3

Front

What is the unit of time?

Back

Preview of the front of card 3

Card 4

Front

What is another word for voltage?

Back

Preview of the front of card 4

Card 5

Front

What does the current through a component depend on?

Back

Preview of the front of card 5
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