An electrical function is the role of a component in an electrical circuit.
The following table describes the main electrical functions.
Click on an electrical function to access the corresponding concept sheet.
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Electrical function |
Description |
Examples of electrical components performing this function |
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Supplies or generates an electric current. |
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Opens or closes the electrical circuit. |
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Allows current to flow from one component to another in a circuit. |
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Prevents the flow of current. |
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Interrupts the flow of current in the event of an electrical issue. |
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Transforms electrical energy into another form of energy. |
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The following table describes other electrical and electronic components and their function.
These concepts are studied in Environmental Science and Technology (EST) and/or Applied Science and Technology (AST) in Secondary 4.
Click on a component to access the corresponding concept sheet.
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Electrical or electronic component |
Function |
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Capacitor (EST and AST) |
Accumulates electrical charges and then releases them quickly. |
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Diode (EST and AST) |
Allows current to flow in a single direction. |
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Resistor (EST and AST) |
Reduces current flow. |
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Relay (AST) |
Opens or closes a circuit using the signal from another nearby circuit. |
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Transistor (AST) |
Blocks or amplifies an electric current. |