When two materials are in contact, and electrons move from one material to the other, which leaves an excess of positive charge on one material, and an equal negative charge on the other.
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What is change in momentum known as?
The impulse.
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What would happen to the brightness of each bulb if you connected 3 bulbs in series, and 3 bulbs in parallel?
In series: each bulb would shine a bit less than the one before it. In parallel: each bulb would have the same brightness.
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Why does each bulb shine less bright than the one before it when connected in series?
Because in series circuits, the full voltage is divided so each bulb gets only part of the voltage.
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Why does each bulb have the same brightness when connected in parallel?
Because in parallel circuits, the full voltage is across every bulb.
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What is the definition of voltage?
The potential difference from one part of a circuit to another.
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Wat is charge?
rate of flow * time
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What is the definition of current?
A flow of charged particles (electrons).
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What does this symbol represent?
Fixed resistor.
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What does this symbol represent?
Fuse.
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What does this symbol represent?
Variable resistor.
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What does this symbol represent?
Thermistor.
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What does this symbol represent?
Diode.
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What does this symbol represent?
Light dependant resistor.
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What is the relationship between temperature and resistance?
The higher the temperature, the lower the resistance.
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What is the relationship between light intensity and resistance?
The higher the light intensity , the lower the resistance.
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What is a retire?
A resistor is an electrical component that restricts the flow of electric current.
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What is resistance?
Resistance is the extent to which an electrical component restricts current.
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Why would the reading on an ammeter go up?
If the resistance of the thermistor decreases.
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What does this graph show?
Current against potential difference for a filament lamp.
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What does the graph for current against potential difference for a filament lamp show?
As the potential difference increases the current starts to increase. Gradually the current increases less and less each time because the filament gets hot. This makes the lamps resistance go up.
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Wat is a filament lamp used for?
Light bulb.
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What does this graph show?
current against potential difference for a fixed resistor.
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What does the graph for current against potential difference for a fixed resistor show?
As the potential difference increases the current also increases. Current is directly proportional to the voltage.
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What is a fixed resistor used for?
To reduce the flow of electricity.
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What does this graph show?
Current against potential difference for a diode.
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What does the graph for current against potential difference for a diode show?
When the diode is connected the right way around then a current flows as the voltage increases. If the diode is connected the other way around then no current can flow because the resistance is too high.
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What is a diode used for?
Breaking a circuit.
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What does this graph show?
Current against potential difference for a LDR.
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What does the graph for current against potential difference for a Ldr show?
As the light intensity increases the resistance starts to decrease. It falls quickly at first but decreases more slowly for higher light intensities.
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What is a LDR used for?
Automatic security lights.
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Other cards in this set
Card 2
Front
What is change in momentum known as?
Back
The impulse.
Card 3
Front
What would happen to the brightness of each bulb if you connected 3 bulbs in series, and 3 bulbs in parallel?
Back
Card 4
Front
Why does each bulb shine less bright than the one before it when connected in series?
Back
Card 5
Front
Why does each bulb have the same brightness when connected in parallel?
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