# Edexcel P2 Unit 2.txt

 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) AuthorHLHSscience ID196278 Card SetEdexcel P2 Unit 2.txt DescriptionEdexcel P2-Unit 2 Updated2013-02-02T09:14:18Z Show Answers