Electricity
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The Voltage
Voltage in open and closed circuits
1) Voltages in a closed circuit
In a closed circuit, the electric current flows and the voltage is always:
- Different from zero for the battery or electric generator.
- Different from zero for a lamp, a motor, a resistance or a bypass diode.
- Zero for a connecting wire or a closed switch.
2) Voltages in an open circuit
In an open circuit the electric current does not flow and the tension is always:
- different from zero for a battery or an electric generator.
- Zero across a lamp, a motor, a resistor, a bypass diode or a switch closed or wire connection.
- Is equal to the Battery's voltage for an open switch or a blocking diode.
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