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  • Created by: zoe
  • Created on: 16-03-14 12:02
What happens when you rub two objects together?
they become electrically charged as electrons
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What happens to the object receiving the electrons when rubbed?
becomes negatively charged
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What happens to the object giving the electrons when rubbed?
becomes positively charged
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What is the electrical charged called when two objects are rubbed together?
static electrivity
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What do two materials with the same type of charge do?
repel each other
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What do materials of opposite charges do?
attract each other
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What is an electrical current?
a flow of charge
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What is current measured in?
amps
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What happens in an electrical circuit?
the components and wires are full of charges, the battery causes the free charges to move, the charges arent used up but flow in a continuous loop
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What are there lots of in metal conductors?
charges free to move
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What are there none of in insulators?
charges free to move
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What is the symbol for cell?
.
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What is the symbol for power supply (battery)?
.
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What is the symbol for filament lamp?
.
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What are the symbols for an open and closed switched?
.
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What is the symbol for a light dependent resistor (LDR?)
.
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What is the symbol for a fixed resistor?
.
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What is the symbol for a variable resistor?
.
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What is the symbol for a thermistor?
.
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What is the symbol for a voltmeter?
.
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What is the symbol for a ammeter?
.
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What current always flows in the same direction?
direct current
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What current changes the direction of flow back and forth continuosly and is used for mains electricity?
alternating current
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What voltage is main supply?
230 volts
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Why is an alternating current used for mains supply?
it's easier to generate, it can be distributed more efficiently, only alternating current can be used in a transformer
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What is another name for voltage?
potential difference
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What happens when you add more batteries into a parallel circuit?
the total potential difference and current remain the same, each battery supplies less current
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What is the potential difference between two points in the circuit?
the work done on/by a given amount of charge as it moves between these points
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What do components do?
resist the flow of charge through them
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The greater the resistance in a circuit the what?
the smaller the current will be
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What happens as the current flows through a component?
moving charges collide with the vibrating ions in the wire, giving them energy, the increase in energy causes the component to heat up
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How do you calculate the resistance?
voltage/current
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What is the symbol for current?
I
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What does the resistor of a thermistor depend on?
the temperature
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What happens in a thermistor as the temperature increases?
resistance decreases, more current flows
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What does the resistance of an LDR depend on?
the light intensity
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What happens in an LDR as the amount of light falling on it increases?
resistance decreases, more current flows
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What happens when two or more components are connected in series to a battery?
the current flowing through each component is the same, the potential difference across the components adds up to the potential difference of the battery, the potential difference is largest across components with the greatest resistance
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What happens in parallel circuits with one component per parallel path?
the current flowing through each component depends on the resistance of each component, the total current running from (and back to) the battery is equal to the sum of the current through each of the parallel components
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In a parralel circuit, what is the potential difference across each component equal to?
the potential difference of the battery
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What is it called when you move a magnet into a coil of wire and a voltage is induced between the ends producing a current when connected?
electromagnetic induction
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Why is a voltage induced during electromagnetic induction?
the magnetic field is being cut
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what is mains electricity produced by?
genertaors
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How can the size of the induced voltage be increased?
increasing speed of magnet rotation, strength of magnetic field, number of turns in the coil, placing an iron core inside the coil
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How do you calculate power?
volts x current
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What is power measured in?
watts
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Why are transformers used?
to change the voltage of an alternating current
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What is a commutator?
s rotary switch that turns with the coil, but brushes it to remain fixed within an electric motor
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What can a current carrying wire/coilin an electric motor do?
experiene a force if placed in a magnetic field whose lines of force are at right angles to the wire, exert a force on a permanent magnet or another current carrier nearby
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Card 2

Front

What happens to the object receiving the electrons when rubbed?

Back

becomes negatively charged

Card 3

Front

What happens to the object giving the electrons when rubbed?

Back

Preview of the front of card 3

Card 4

Front

What is the electrical charged called when two objects are rubbed together?

Back

Preview of the front of card 4

Card 5

Front

What do two materials with the same type of charge do?

Back

Preview of the front of card 5
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