Electronics …
description
Transcript of Electronics …
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Electronics…
And more practical uses of electricity
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• Current types:– Alternating current (AC)– Direct current (DC)
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Electrical Functions
• 1. Power supply: – Supplies energy to the circuit– Examples: Battery, power supply, photovoltaic cell
• 2. Conduction:– Ability to transfer electrons
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Factors that affect conduction
• Length:– The shorter the wire the better the conductor
• Diameter– The wider the wire the better the conductor
• Temperature– The colder the wire the better the conductor
• Nature of the material– A metal is better than a metalloid (carbon) which is
better than a non-metal
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• 3. Protection:– Element whose goal is to protect the circuit in
case of a surcharge
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a) Fuse
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b) Breaker
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1. Defines power supply
2. Determines the source of current in technical objects with an electrical circuit
3. Defines conduction
4. Distinguishes between electrical conductors and insulators in a technical object
5. Describes the role of a protective device in a circuit
6. Analyzes the factors that affect electrical conductivity
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Electrical functions continued
• 4. Insulation: – Element whose function is to slow down the
electrical current
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a) Resistors
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p.468
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5. Uses the colour code to determine the electrical resistance of a resistor
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Printed circuits
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6. Describes the operation of a printed circuit
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Electrical Functions
• 5. Control– Component that has the ability to control the flow
of electricity in a circuit
– Flip flop switch, lever switch, push button, magnetic switch
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Defining switches
• UniPolar vs. Bipolar • Unidirectional vs Bidirectional
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1. Defines control as the ability to control the travel of electrical current
2. Describes different types of switches (lever, pushbutton, flip-flop, magnetic control)
3. Distinguishes between unipolar and bipolar switches
4. Distinguishes between unidirectional and bidirectional switches
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Electrical Functions
• 6. Transformation of energy– Any component that has the ability to transform
electrical energy into another form of energy (heat, light, magnetism, vibration)
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• 7. Relay– Function: Element that uses a small amount of
power to switch another circuit which requires a larger amount of power
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• 8. Condenser (Capacitor)– Function: Stores energy• Allows to even out current fluctuations• Allows to discharge stored energy in one shot (e.g.
camera flash)
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• 9. Diode– Allows the current to flow in only one direction• Has low resistance one way, incredibly high resistance
the other)• Converts Alernating current into direct current
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• 10. Transistor– Function: Amplifies an electronic signal– Used in computers – binary code
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1. Associates the transformation of energy with different components of a circuit (e.g. bulbs transform electrical energy into light and heat)
2. Describes the energy transformations that take place in electrical or electronic appliances (e.g. in a cell phone, electricity is transformed into light for the display and vibrations for the sound)
3. Describes the function of certain electronic components (condenser, diode, transistor, relay)
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