Unit 2: Electricity
- Created by: tdicks
- Created on: 24-11-18 15:11
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- Electrons
- Power
- Voltage
- Resistance
- in parallel
- resistance is less than the smallest resistance value
- because a larger amount of electrons flow through the circuit
- resistance is less than the smallest resistance value
- in series
- R = r1+r2+r3
- because electrons make more collisions
- R = r1+r2+r3
- depends on ...
- length of wire
- REQUIRED PRACTICAL
- light intensity
- temperature
- I/V graphs
- wire resistor
- DIAGONAL
- as V increases
- resistance is constant
- resistance = 1/gradient
- Untitled
- resistance increases
- because temperature of filament increases
- electrons collide more and vibrate with positive ions
- because temperature of filament increases
- V is directly proportional to I
- ohmic conductor
- Untitled
- Untitled
- resistance is constant
- as V increases
- DIAGONAL
- filament lamp
- S SHAPE
- as V increases
- resistance is constant
- resistance = 1/gradient
- Untitled
- resistance increases
- because temperature of filament increases
- electrons collide more and vibrate with positive ions
- because temperature of filament increases
- V is directly proportional to I
- ohmic conductor
- Untitled
- Untitled
- resistance is constant
- as V increases
- S SHAPE
- LED
- LINE, UP
- LINE, UP
- required practical
- wire resistor
- length of wire
- R = V/I
- V = voltage
- measured in volts
- I = current
- measured in amps
- R = resistance
- measured in ohms
- V = voltage
- in parallel
- Current
- ammeter connected in series
- resistance very small
- doesnt reduce current
- resistance very small
- always the same current
- because charge is reserved
- current leaving cell is current entering cell
- because charge is reserved
- sum of current in parallel are branches added up
- I = Q/t
- I = current
- measured in amps
- Q = Charge
- measured in coulombs
- t = time
- measured in seconds
- I = current
- electron flow is ac
- 230 mains voltage
- provided by power station
- step up transformer connected
- reduces current in overhead cables
- step down transformer connected
- reduces voltage
- step down transformer connected
- step down transformer connected
- reduces voltage
- increases voltage
- reduces current in overhead cables
- step up transformer connected
- 3 pin plug
- case
- plastic
- insulator
- plastic
- wires
- copper
- conductor
- copper
- earth wire
- green and yellow stripes
- 0 volts
- carrries current if there's a fault
- prevents appliance becoming live
- carrries current if there's a fault
- 0 volts
- green and yellow stripes
- neutral wire
- blue
- 0 volts
- carries current back to source
- prevents user getting an electric shock
- carries current back to source
- 0 volts
- blue
- live wire
- brown
- 230 volts
- contains a switch
- very dangerous
- contains a switch
- 230 volts
- brown
- contains
- 2 cores
- live and neutral
- 3 cores
- live, neutral and earth
- 2 cores
- case
- provided by power station
- flow reverses 50 times per second
- 50 Hz
- 230 mains voltage
- electron flow in one direction is direct current
- provided be cells and batteries
- contain chemical energy stores
- provided be cells and batteries
- ammeter connected in series
- Electrostatic Charge
- when you gain electrons, you gain negative isulator charge
- eg. brushed hair stands on end
- when you loose electrons, you gain positive insulator charge
- Electrostatic Charge
- when you gain electrons, you gain negative isulator charge
- eg. brushed hair stands on end
- when you loose electrons, you gain positive insulator charge
- eg. brushed hair is attracted to brush
- force at a distance is a non-contact force
- force is experienced at an electric field
- point charge is radial
- ARROWS OUTWARDS
- repulsive charge on a positive charge
- force decreases as distance from charge increases
- arrows show direction of force on a positive charge
- ARROWS OUTWARDS
- repulsive charge on a positive charge
- force decreases as distance from charge increases
- ARROWS INWARDS
- attractive charge on a positive charge
- ARROWS OUTWARDS
- ARROWS INWARDS
- attractive charge on a positive charge
- ARROWS OUTWARDS
- causes sparking between charged object and earth
- when force on air icles is large enough to ionise air
- so electrons are transferred between charged object and earth
- when force on air icles is large enough to ionise air
- point charge is radial
- force is experienced at an electric field
- when you gain electrons, you gain negative isulator charge
- eg. brushed hair is attracted to brush
- Electrostatic Charge
- force at a distance is a non-contact force
- force is experienced at an electric field
- point charge is radial
- arrows show direction of force on a positive charge
- arrows show direction of force on a positive charge
- causes sparking between charged object and earth
- when force on air icles is large enough to ionise air
- so electrons are transferred between charged object and earth
- when force on air icles is large enough to ionise air
- point charge is radial
- force is experienced at an electric field
- when you gain electrons, you gain negative isulator charge
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