a build up of friction. ( when two insulation materials rub together)
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what is an electric current?
the flow of charge around a circuit
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why is it easier for current to flow through metal than it is plastic?
metal is full of charges(electrons) which are free to move. plastic is an insulator therefore there are few charges free to move.
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what does a current need inorder for it to flow? why is this?
voltage and resistance. the voltage pushes the current through resistance slows down the flow of charge.
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give the equation for power and units
POWER(W)=VOLTAGE(V) x CURRENT(A)/(I)
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What is potential difference?
The proper name for voltage
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what does a voltmeter do?
measures potential difference between two points
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what does a voltmeter do?
measures potential difference between two points
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on a voltage-current graph, what does a slope show?
resistance
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give the equation for working out resistance
resistance = voltage / current or V/I=R
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what does LDR stand for?
Light- dependent resistor
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how does a thermistor work?
it changes resistance depending on temperature. in hot conditions the resistance drops and it cool, it goes up.
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how is a series circuit set up?
everything in one line. all components connected in a line end to end.
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in a series circuit, what is shared among the components?
potential difference(voltage) and current.
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what is the difference between a series and a parallel circuit
series is linked and parallel is independant
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between the different branches what is shared in a parallel circuit
total current
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what kind of electricity supply is given in mains?
AC
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what kind of electricity supply is given in a battery?
DC
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how could you induce a voltage?
moving a magnet into a coil of wire
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which four factors affect the size of the induced voltage?
having iron core inside the coil of wire. increasing the strength of the magnetic field. increasing the speed of rotation. increase the number of turns in the coil.
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what does a transformer do? which electricity supply does it act in?
changes the voltage. it can either raise it or lower it. it only works in ac voltages
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what does a rectangular coil do to a magnetic field?
it reinforces the magnet field.
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which particles move when static builds up?
negative (electrons only)
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what voltage is the UK mains electricity supplied at?
230
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Other cards in this set
Card 2
Front
what is an electric current?
Back
the flow of charge around a circuit
Card 3
Front
why is it easier for current to flow through metal than it is plastic?
Back
Card 4
Front
what does a current need inorder for it to flow? why is this?
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