If the switch is closed (connected) the voltage across it will read 0V. If the switch is open (disconnected) the voltage across it could be anything, it just depends on what the voltage between the wires going into the switch is.
A voltmeter has the large resistance.The voltage across any component can be measured if & only if the terminals of that component will be open and this will we can acheiv if we connect the high resistance voltmeter across the open terminals of that component to measure the voltage.
Sounds more like you're trying to measure resistance...
If the switch is open, current does not flow.
Assuming you're referring to a simple incandescent bulb . . .When the bulb burns out, the filament is open, and it is electrically no longer there.The voltmeter is then across the battery, which is open circuited, i.e. without a load.The meter measures the open-circuit voltage of the battery, nominally 6 V.
When the switch is open, the voltmeter measures the potential difference or voltage across the two points connected by the switch, as no current flows through the circuit. This measured voltage is often referred to as the open-circuit voltage.
If the switch is closed (connected) the voltage across it will read 0V. If the switch is open (disconnected) the voltage across it could be anything, it just depends on what the voltage between the wires going into the switch is.
A voltmeter has the large resistance.The voltage across any component can be measured if & only if the terminals of that component will be open and this will we can acheiv if we connect the high resistance voltmeter across the open terminals of that component to measure the voltage.
The voltmeter function if the circuit is energized or the ohmeter function if looking for short or open circuits
Sounds more like you're trying to measure resistance...
Because, by definition, a voltage is the difference in potential between two different points. So the voltmeter must be connected across those points in order to measure that voltage -i.e. in parallel with the points.B
1: check the switch that the brake pedal opens and closes when you (respectively) release and apply the brake. using a voltmeter, verify that no voltage passes when the switch is open (brakes unapplied) - if there is continuity when there should not be, then the switch is the problem. you will have to be more specific beyond "stuck" if this does not help you.
If the switch is open, current does not flow.
open switch symbol
Assuming you're referring to a simple incandescent bulb . . .When the bulb burns out, the filament is open, and it is electrically no longer there.The voltmeter is then across the battery, which is open circuited, i.e. without a load.The meter measures the open-circuit voltage of the battery, nominally 6 V.
The source voltage.
1. No power coming to your switch. Check your circuit breaker. If it is tripped, you have a "short" somewhere in the circuit. You will have to isolate the circuit. If it's not tripped, go to step 2... 2. A bad switch - Which you already replaced. You might want to check (use a voltmeter) to see if you are getting incoming voltage on your switch. If you are, go to step 3. If there is no power, it means you have a broken wire somewhere in between the switch and the breaker panel. 3. An open wirefrom the the switch to the ceiling fan electrical box. Again, check by using a voltmeter to confirm that the wire on the ceiling fan is getting power when the switch is "ON". If you are getting power go to step 4... 4. Bad ceiling fan - Removed and replace. Note: An open neutral wire (white wire) can also be the cause of the problem. Consult an electrician if you are not sure what to do.