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If a circuit has no switch then it remains 'on' permanently. If you desire to open or close a circuit, for turning on or turning off a light for example, you need some kind of switch.

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13y ago

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Related Questions

What does the on and off switch do on an electrical circuit?

The on and off switch controls the flow of electricity in the circuit. When the switch is on, it completes the circuit and allows electricity to flow through. When the switch is off, it breaks the circuit and stops the flow of electricity.


Do you need a switch to control each load in a parallel circuit?

Yes.


Why do you need a switch in a circuit?

To Complete the Circuit To allow the Electrons to Flow from the conducting material and to avoid the shocks plastics are used


What happened when you turned on the switch of the light?

A switch is placed in an electrical circuit in order to place a gap when the switch is off, so the circuit is broken. When the switch is on, the circuit is complete and the electricity can flow round the circuit.


Will a circuit work without a switch?

Yes, a circuit can work without a switch if it is designed to be always on or if the components are connected directly without the need for a switch to control the flow of current. However, in many applications, a switch is necessary to control when the circuit is on or off.


Why would i need a 20-Amp Single-Pole Switch insted of a 15 Amp?

You would need a 20 amp switch when the load controlled by the switch can draw as much as 20 amps. If you have a 20 Amp breaker supplying the circuit then you need to size all switches and outlets on that circuit to 20 amps.


How does a circuit turn a switch on and off?

A switch makes a physical break in the electric circuit. With the circuit broken the electricity can not flow. When the switch is turned the other way the circuit is completed and the current/electricity can flow.


What is a fixed bias circuit?

it is a switching device that need a current..so u will need a resistor to open the switch..


What position does the switch have to be in for a circuit to work?

The switch needs to be in the "on" position for the circuit to work, allowing the flow of electricity through the circuit. In the "off" position, the switch breaks the circuit, stopping the flow of electricity.


Why would you need a 20 Amp Single Pole Switch insted of a 15 Amp?

A 20 Amp single pole switch is needed when the circuit requires higher amperage capacity to safely control the load. Using a 15 Amp switch on a circuit that requires 20 Amps could lead to overheating and potential fire hazards. Always match the switch's amperage rating with the circuit's requirements for safety and proper functionality.


Where can i place the switch in the lemon circuit?

Not sure what you mean with "lemon circuit", but in an electrical circuit, the switch can be just about anywhere.


What does a switch do to effect a series circuit?

For an electrical circuit to keep going, it cannot be interrupted. When the switch is adjusted, the electrical flow is interrupted. Move the switch again and the flow is restored. Without a switch a circuit is no longer considered a complete circuit. Simple fifth grade science.