Starter: (don’t write a title or date yet!) You have 5 minutes. Look at your marked work – look over the comments and with a green pen answer the question or corrections you have been given.

The Van de Graaff generator is a machine for creating static electricity. The moving belt carries charge from the lower comb to the upper comb and collecting sphere where it builds up. When a person (insulated) puts their hand on the dome while it is charged, their hair stands on end. The charge builds up in them and as like charges repel it tries to get as far away as possible from itself.

How does a lightning conductor work? A Lightning conductor is used to provide a low resistance path to conduct charge away. As the ice particles in the cloud rub together are rubbed off. The cloud collects these __________ and becomes very negative. These n________ electrons (charge) move towards the lighting rod which then conducts the charge away. Q. Why is the lightning conductor taller than the building and made of metal?

How does a lightning conductor work? A Lightning conductor is used to provide a low resistance path to conduct charge away. As the ice partices in the cloud rub together electrons are rubbed off. The cloud collects these electrons_ and becomes very negative. These negative_______ electrons (charge) move towards the lighting rod which then conducts the charge away. Q. Why is the lightning conductor taller than the building and made of metal? A shorter path and a better conductor

How does a lightning conductor work? A Lightning conductor is used to provide a low resistance path to conduct charge away. As the ice particles in the cloud rub together are rubbed off. The cloud collects these __________ and becomes very negative. These n________ electrons (charge) move towards the lighting rod which then conducts the charge away. Q. Why is the lightning conductor taller than the building and made of metal?

Input and output devices 14-Sep-15 Learning Goals Name some input and output devices Use the correct symbols and vocabulary to show an electronic circuit in action Explain what a binary system is and relate this to electronic systems and digital instruments

Copy: Circuits with microchips and other semiconductor devices are called ‘electronic circuits’. Most handle very low currents but they can control much more powerful circuits. List as many devices in your home that you think have electronic circuits.

Electronic Circuits have an input, processor and an output. Input devices detects changes in the environment Processors process information received from the input device decide on action by the output device Output devices carry out the appropriate action

A loudspeaker INPUT PROCESSOR OUTPUT

Write down the (i) input and the (ii) output device for the following: A burglar alarm An electric guitar A torch Automative doors in a shop You hearing your name

Using the worksheet ‘23d’ Sensor complete the table below: What it detects Symbol Micro switch Tilt switch Reed switch Moisture sensor Microphone Light dependent resistor Thermister

Output What it outputs Symbol Filament lamp Light emitting diode Motor Homework: Using the worksheet ’23e’ Outputs complete the table below- then learn the names and symbols for all the sensors and outputs Output What it outputs Symbol Filament lamp Light emitting diode Motor Buzzer Loudspeaker

Analogue or digital?

Electronic systems are often digital devices – they often have two states on or off and a system with only two states is called ‘the binary system’

Binary Logic Electronic systems are often binary systems. A binary system has just two states: OFF and ON When it is off, the binary code is 0 When it is on, the binary code is 1 COPY AND COMPLETE Binary Code Switch Lamp Bell Current Flowing? Answer to a question Logic 1 ON YES OFF SILENT NO