Voltage describes the “pressure” that pushes electricity. The amount of voltage is indicated by a unit known as the volt (V), and higher voltages cause more electricity to flow to an electronic device. However, electronic devices are designed to operate at specific voltages; excessive voltage can damage their circuitry.
By contrast, too low a voltage can cause issues, too, by preventing circuits from operating and making the devices built around them useless. An understanding of voltage and of how to rectify associated issues is necessary in order to handle electronic devices appropriately and identify the underlying issues when problems occur.
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