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404377
Physics - P5
Descripción
OCR 21st Century Science - P5
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gcse
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jacobaxford
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jacobaxford
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Resumen del Recurso
Physics - P5
Static Electricty
Caused by Friction
When INSULATING materials are rubbed electrons are transfered
Electrons are negatively charged
The particle loosing the electrons gains a positive static charge and negative on the particle gaining
Think of it being positive for donating the electrons
Which depends on the materials
The particles left positively charged are called ions
Charges
Opposite charges like magnets attract
'Opposites attract'
When two charges are the same they repel
When the electrons from one object are put on another the object becomes negatively charged
They try to repel as they are the same charge
As the material is insulating the positions are fixed so the electrons cant move
A static charge is the result!
Electric Current
Current is the flow of charge
Electric circuits use conductors (e.g. Metal)
In conductors the charges are free to move
In a circuit the change flows from the battery and back to it (not used up)
Dependent on Voltage and Resistance
Current is measured in amps
Shown as 'I' in equations
Only flows if there is voltage
Voltage is measured in volts
Voltage is the force pushing the current
Resistance is a something that slows a charge
Measured in OHMS - Ω
Can be components such as a light
Amps in easy terms is the number of charged particles flowing past in a second
Power - Rate of Energy Transfer
Power supply provides energy to change
Rate that a supply transfers energy to component
Measured in watts
P=Watts V=Volts I=Amps
Resistance
The voltage in a circuit is relative to the current
Using this graph we find the resistance
Steeper the graph the less resistance
We use this to find the resistance
Resistors get hot when they pass through a purpose resister such as a light as the electrons collide with ions
Circuits
Recursos multimedia adjuntos
Attract-Repel-Electrostatic-Charges.gif (image/gif)
Power_is_V_times_I_triangle (image/png)
aqaaddsci_02.gif (image/gif)
Ohm_s_Law_1_ (image/jpg)
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