Physics - P5

jacobaxford
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OCR 21st Century Science - P5

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jacobaxford
Created by jacobaxford almost 6 years ago
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Physics - P5
1 Static Electricty
1.1 Caused by Friction
1.1.1 When INSULATING materials are rubbed electrons are transfered
1.1.1.1 Electrons are negatively charged
1.1.1.2 The particle loosing the electrons gains a positive static charge and negative on the particle gaining
1.1.1.2.1 Think of it being positive for donating the electrons
1.1.1.2.2 Which depends on the materials
1.1.1.2.3 The particles left positively charged are called ions
1.2 Charges
1.2.1 Opposite charges like magnets attract
1.2.1.1 'Opposites attract'
1.2.2 When two charges are the same they repel
1.2.3 When the electrons from one object are put on another the object becomes negatively charged
1.2.3.1 They try to repel as they are the same charge
1.2.3.1.1 As the material is insulating the positions are fixed so the electrons cant move
1.2.3.1.1.1 A static charge is the result!
1.2.3.1.2
2 Electric Current
2.1 Current is the flow of charge
2.1.1 Electric circuits use conductors (e.g. Metal)
2.1.1.1 In conductors the charges are free to move
2.1.1.2 In a circuit the change flows from the battery and back to it (not used up)
2.1.2 Dependent on Voltage and Resistance
2.1.2.1 Current is measured in amps
2.1.2.1.1 Shown as 'I' in equations
2.1.2.1.2 Only flows if there is voltage
2.1.2.1.2.1
2.1.2.2 Voltage is measured in volts
2.1.2.2.1 Voltage is the force pushing the current
2.1.2.3 Resistance is a something that slows a charge
2.1.2.3.1 Measured in OHMS - Ω
2.1.2.3.2 Can be components such as a light
2.1.3 Amps in easy terms is the number of charged particles flowing past in a second
2.2 Power - Rate of Energy Transfer
2.2.1 Power supply provides energy to change
2.2.2 Rate that a supply transfers energy to component
2.2.3 Measured in watts
2.3
2.3.1 P=Watts V=Volts I=Amps
3 Resistance
3.1 The voltage in a circuit is relative to the current
3.1.1
3.1.1.1 Using this graph we find the resistance
3.1.1.1.1 Steeper the graph the less resistance
3.1.1.1.2 We use this to find the resistance
3.1.1.1.2.1
3.1.1.1.3 Resistors get hot when they pass through a purpose resister such as a light as the electrons collide with ions
4 Circuits