Edexcel P2 Unit 2.txt
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Give an example of a type of material that electrical charges can move through easily
Metals

What is electric current?
A flow of electric charge

What is the unit of electrical current?
Ampere (Amp) (A)

How is the size of a current (I) calculated from the total charge (Q) and time (t)?
I = Q/t

What is the standard unit of electrical charge?
Coulomb (C)

What is potential difference another name for ?
Voltage

What is this the symbol for?
Switch (open)

What is this the symbol for ?
Switch (closed)

What is the symbol for a fuse?

What is the symbol for a cell ?

What is the symbol for a battery ?

What is this the symbol for ?
Diode

What is this the symbol for ?
Variable resistor

What is this the symbol for ?
Resistor

What is this the symbol for ?
Light Dependent Resistor (LDR)

What is this the symbol for ?
Thermistor

What is this the symbol for ?
Lamp

What is the symbol for a voltmeter?

What is the symbol for an ammeter?

What component is this graph for?
Resistor

If a component has a larger resistance, will the current be larger or smaller?
Smaller

In a series circuit, what do you know about the current at different points?
It is always the same

In a series circuit how is the total resistance calculated?
By adding up the individual resistances

For components connected in parallel what do you know about the potential difference across each component?
They are all the same

What component is this graph for?
Filament bulb (lamp)

Which component only allows current to flow one way?
Diode

What component is this graph for?
Diode

What happens to the resistance of an LDR as light intensity increases?
The resistance decreases

What happens to the resistance of a thermistor as temperature increases?
The resistance decreases

What happens when an electrical charge flows through a resistor?
It gets hot

Are ammeters connected in a circuit in series or parallel?
Series

Are voltmeters connected into a circuit in series or parallel?
Parallel

What is the difference between a normal resistor and a variable resistor?
The resistance of a normal resistor does not change but you can manually alter the resistance of a variable resistor

What is the unit of resistance and what is the symbol?
Ohm

What affects the resistance of an LDR?
Light intensity

In a bright light, does the resistance of an LDR increase or decrease?
Decrease

What does the resistance of a thermistor depend upon?
Temperature

Does the resistance of a thermistor increase or decrease when it gets warmer?
Decrease

What unit is used to measure power?
Watt (W)

What is power?
The rate at which energy is used. (How quickly it is used)

What is the unit of energy?
Joule (J)