Introduction to Current Electricity and Circuits
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Transcript of Introduction to Current Electricity and Circuits
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Introduction to Current Electricity and Circuits
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Learning Goals
By the end of this class I should be able to…
• …identify basic components of a circuit diagram
• …explain proper safety procedures regarding the use of electricity
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Introduction to Current Electricity
Current Electricity• A steady flow of electric charges that
move through a conductor in a controlled way.
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Current Electricity vs. Electrostatic Discharge
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Current Electricity vs. Electrostatic Discharge
• Similarities– Both involve the movement of electrons
• Differences– Electrostatic Discharge follows an
unpredictable path and occurs very quickly
– Current follows a controlled path to power a device and is a steady flow of electrons.
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What causes electrons to flow?• Electric Cells
– A portable device that converts chemical energy to electrical energy
– Consist of two electrodes and a conducting solution called an electrolyte
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What causes electrons to flow?• Fuel Cell
– Uses a continuous supply of chemicals to operate.
– Hydrogen fuel cell.
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What causes electrons to flow?• Solar Cell
– Uses energy from the Sun to create electric energy
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Parts of a Circuit
1. Electrical Source– The source of the electrical energy in a
circuit– Common Examples:
• Battery
• Outlet
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Introduction to Current Electricity
2. Conductors– The part of the circuit that creates the
path for the electricity to flow.
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Introduction to Current Electricity
3. Control or Switch– A device in a circuit that controls the flow
of electrons by opening or closing the circuit.
Circuit symbol
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Introduction to Current Electricity
4. Load– The part of the circuit that converts
electrical energy into other forms of energy.
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Grade 9 Circuit Symbols
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Introduction to Current Electricity
Current Electricity• A steady flow of electric charges that
move through a conductor in a controlled way.
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Electrical Safety
1. Always ensure that your hands are dry and that you are standing on a dry surface
2. Do not use faulty equipment– Corroded batteries– Frayed wires
3. Only operate a circuit after it has been approved by your teacher.
– Incorrect connections could cause short circuits or explosions.
4. Always open the circuit before making any changes.