2-Electricity

• how ammeters and voltmeters connected in a circuit

  ammeter- in series with the resistor

  voltmeter- in parallel with the resistor
• switch is used to turn a circuit on and off

  
• filament lamp is heated by the electrical current to give out light

  
• voltmeter measures the potential difference

  
• ammeter measures the current

  
• fixed resistor limits the flow of electric current and it's resistance does not change

  
• LDR is a light dependent resistor, as light intensity increases the resistance decreases they are inversely proportional
• thermistor is dependent on temperature, as temperature increases the resistance decreases, they are inversely proportional

  
• variable resistor has a slider to increase and decrease it's resistance to limit the flow of electric current

  
• diode only allows the current to flow in one direction, they are used to convert AC(alternating current) to DC(direct current)

  
• LED is a light-emitting diode which emits light when an electric current flows through it

  
• fuse breaks the circuit by melting the wire if too much current flows through it

  
• cells and batteries provide the voltage needed in a circuit. The longer line is the positive terminal, the shorter line is the negative terminal

  
• current (I) is the measure of the flow of electrons around a circuit, measured in Amps (A)
• potential difference (V) is the force driving the flow of electrons, measured in Volts (V)
• resistance (R) is everything that resists or opposes the flow of electrons, measured in Ohms (Ω)
• current flows from the positive terminal to the negative terminal (conventional current)
• voltage = current x resistance
• fixed resistor graph because the resistance stays constant

  
• filament lamp graph because it starts decreasing as temperature increases due to the resistance

  
• diode graph because it only allows the current to flow in one direction and is only showing current when the potential difference is positive

  
• for wires and resistors increasing the temperature will increase the resistance because the ions in the metal wire will vibrate faster and therefore making it harder for the electrons to pass