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The full circuit voltage
The voltage measured across an open in a series circuit is the equivalent of the sourse voltage.
If the switch is what is keeping the load from turning on, then yes, there is a voltage across the open switch.
An NPN or sinking output accepts voltage and sinks it to ground to complete the circuit. A PNP or sourcing output sources voltage and the external circuit sinks it to ground to complete the circuit. A sourcing circuit would be drawn as voltage->switch->load->ground. A sinking circuit would be drawn as Voltage->load->switch->ground. In these cases, the switch could be a transistor.
when the pressure switch detects some pressure it turns the circuit on and sometimes depending on the programming in accordance with the amount of pressure it could do different things.
Closing a switch in an electrical circuit will complete the circuit. The supply voltage will then be applied to that circuit, and current will flow through that circuit.
To de-energize a circuit, the voltage has to be cut off at the source. This is usually done with a disconnect switch which is located just before the circuit's load. Turning off the breaker on a distribution panel will de-energize the circuit it is feeding. To make sure that the voltage can not be turned back on when work is being done on the circuit, the switch or breaker must have a lock off device to prevent the circuit from being turned on, except by the person that locked the circuit off.
this is a circuit in which the switch is located before the load in the circuit
When the light switch is turned on and a light bulb is connected in the circuit a current will flow through the circuit. Likewise when the switch is opened, the current will stop flowing in the circuit.
the electrons are not allowed to enter into the circuit.
Such a circuit either has no voltage source, or some part of the circuit is open, e.g., an open switch.
Replace the clutch pressure switch in your Honda.