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When measuring voltage the unit power should be turned off or on?
Wiki User
∙ 10y ago
With the power turned off the voltages in the unit should be zero so no information would be gathered, excect that it it isn't zero there's a serious fault.
The power should stay off until the voltmeter is connected, and then the operator should step back and turn the power on using one hand only.
Wiki User
∙ 10y ago
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The electrical circuit voltage drops when an appliance is turned on. (Lights dim, etc.) A new circuit is needed or you could purchase a UPS (Uninterrupted Power Supply) to act as a buffer and prevent the voltage drop. JR
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How do you find the voltage?
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What is important when measuring power?
To measure power, you need the Voltage, and Current. In the case of AC you need the number of phases, and the power factor. Once you have these, you can find the proper formula.
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What is wrong with your 240 outlet if it is only outputting 120v and breakers are just fine?
A breaker will not step-down power/ voltage. Its most likely a problem from your suppliers. More likely you aren't measuring the voltage correctly. There is 120 V between neutral and either Hot wire. There should be 240 between the two hot wires. If this is what you are measuring and you are sure the breaker is 240 volts you should be able to measure 240 at the output of the breaker. If it isn't there your panel has a problem.
Two technicians are discussing how to measure the voltage outputs of a power supply. Technician A says that the power supply must be connected to the system and turned on before voltage can be measu?
It does have to be turned on. A highly regulated PS will be the same under load as without a load. But it may not be able to supply the amps. Best connect it and test it. WHO WON?
. Two technicians are discussing how to measure the voltage outputs of a power supply. Technician A says that the power supply must be connected to the system and turned on before voltage can be measu?
It does have to be turned on. A highly regulated PS will be the same under load as without a load. But it may not be able to supply the amps. Best connect it and test it. WHO WON?
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Net voltage in the Neutral of a three phase electrical system is called residual voltage.
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Parasitic voltage drain is typically power that is being drawn from a power source when an item should be "off". For example; when a car is turned off typically it is still drawing small amounts of power to run a clock or keep an alarm funtioning. This could be considered a parasitic voltage drain. Sometimes in household systems it is also referred to as phantom power. Some companies like Roemtech (which manufactures classroom audio systems) spends a lot of time and money trying to reduce parasitic or phantom voltage drain. This can amount to a lot of power savings over the span of a year.
