Voltage, Current, and Resistance

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Understanding Voltage

Voltage is the electrical pressure or potential difference that drives current through a circuit. Think of it like water pressure in a pipe.

Voltage Key Points
  • Measured in Volts (V)
  • Represents electrical potential energy
  • Common values: 1.5V (batteries), 5V (USB), 220V (mains)
  • Symbol: V or U
Electrical-quantities