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physics GCSE
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summary of entire GCSE physics specification. I achieved grade 9 using these methods.
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Electricityphysics
,Circuit symbols
• Fixed resistor limits the flow of electrical curren
resistance that does not change.
• Variable resistor moving the position of the slid
the resistance, used in some dimmer switches a
controls.
• Thermistor resistance depends on its temperat
temperature it has high resistance. As the temp
increases, the resistance decreases. Used in the
heat activated fire alarms.
• Light-dependent resistor (LDR) resistance depe
intensity. At low light levels it has high resistanc
light intensity increases, resistance decreases. U
sensor in cameras or automatic lights.
• Semiconductor diode allows current to flow in
only. Diodes are used to convert an alternating
a direct current.
, Charge and current
• Charge is a property of a body which experiences a force in an elec
field. Charge is measured in coulombs
• Charge= current x time Q=It
• Electrical current is a flow of electrons.
• Current is measured using an ammeter. The ammeter must be plac
in series with that component.
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