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Plastic
Means 'easily shaped' and is derived from non-renewable resources such as crude oil.
Types of Plastic
Divided into Thermoplastic (recyclable, can be reformed after heating) and Thermosetting (mostly non-recyclable, cannot be reformed).
Recycling of Plastic
Vital due to pollution caused by plastic, involves processing used plastic into new products.
3R's of Recycling
Reduce, Reuse, Recycle.
Reduce
Limit plastic use by opting for alternatives like reusable bags.
Reuse
Encourage the use of reusable containers and bags.
Recycle
Involves sorting used plastic by type (using identification codes) for processing.
Steps for Recycling
Include Collecting, Sorting, Shredding, Cleaning, Melting, and Manufacture of Grains.
SPST Switch
control device. opens or closes a circuit
Puch switch
control device. temporary closes a circuit
single pole double throw
control device. diverts the current down either one or two possible paths
voltmeter
must always be conected in parallel
ammeter
must always be connected in series
diode
a control device that allows current to flow in only one direction
LED
a control device that allows current to flow in only one direction and emits light at the same time
LDR
a sensor: light dependant resistor
thermistor
a sensor that detects change in temperature
transistor
control device: amplifies or multiplies current or can act like a switch
capacitor
control device that can store and release energy
