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Why are electrical devices rated with both a voltage and a current?
Wiki User
∙ 13y ago
The short answer is you need power. And power is the product of voltage and current: P = V*I. As either V or I approaches zero, P approaches zero. So, you need voltage and current flow to generate the power needed to operate an electrical circuit.
Wiki User
∙ 16y ago
Wiki User
∙ 13y agoElectrical devices are usually rated with both a voltage and a current in order for the user to determine if the voltage and resulting current is within the limits of the device's capacity to function normally. For example, if a device has a rated voltage of 110Vac then that means that it only needs 110Vac to work. If you use 220Vac, the device will definitely be damaged due to over voltage since the components of that particular device was built around 110Vac and not 220Vac. For the current rating, it is mostly used to determine if the cables of the existing electrical system has the capacity to handle the amount of current produced when the device is used. Most electrical cables and wires have limits as to the amount of current that the conductor can handle. To sum it up, voltage and current ratings are used in order to protect the device and to protect the existing electrical system.
Wiki User
∙ 7y agoBecause current won't flow unless there is a potential difference (voltage) between the two parts of the circuit. It's the potential that excites the electrons allowing them to move.
Wiki User
∙ 7y agoThe voltage is like the "force" (though it doesn't have units of force) that push the electrons. Without this force, the electrons will remain in their place, at least on average.
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What is meaning oof rated values of current voltage power and torque of an electrical machine?
What it means is that those rated values may not be exceeded, they are the maximum that the machine can take.
What is the current of a 45 kva transformer?
Presumably, you are asking what is the rated secondary current for a 45 kV.A (not 'kva') transformer? The answer depends on its rated secondary voltage. To obtain the rated secondary current, you divide the (apparent) power rating by its secondary rated voltage.
What is current capacity of 1200kva genarator?
The current rating of a 16 kV.A (not 'kva') depends upon the voltage rating of that generator, with 16 kV.A being the product of the rated current and the rated voltage.
What is rated insulation voltage?
Rated insulation voltage is the maximum voltage that can be applied to the insulation of an electrical device without causing a breakdown or failure. It is a measure of the insulation's ability to withstand high voltage without impacting its performance or safety. The rated insulation voltage is typically specified by the manufacturer and is an important parameter to consider when designing or selecting electrical equipment.
What is short circuit ratio?
Ratio of field current required to produce rated voltage in open circuit to the field current required to produce rated current in short circuit.
What is rated voltage and current in transformers and how to calculate them if given 50k VA?
Rated voltage is the voltage at primary side. Rated current can be found from the equation, Rated Current= Output KVA / Output rated voltage
Have 160 volts electrical plugs?
In North America there are no plugs that are rated for 160 volts. The voltage rating on electrical devices for residential and commercial are 300 and 600 volts respectively.
What is meaning oof rated values of current voltage power and torque of an electrical machine?
What it means is that those rated values may not be exceeded, they are the maximum that the machine can take.
What damages a rectifier?
Rectifiers are electrical parts, all electrical parts are rated for 3 things. 1) voltage 2) current 3) temperature Exceed any of these things and the electrical part will fail.
What is considerede low voltage?
Low voltage is a relative term, as there is no 'level' at which a voltage is rated 'low'. Electrical safety codes define low voltage as circuits that do not require the same protections necessary at higher voltages.
What is meant by rated voltage rated current and rated power of a transformer?
The ratings state the limits on voltage and current for operating the transformer at full load. The rated voltage times the rated current gives the rated VA of the transformer. Transormers are not usually rated directly for power because this depends on the power factor of the load applied.
What is meant by rated voltage?
the voltage which is mainly applied to primary side of the transformer is called rated voltage.Answer'Rated voltage' is the nominal voltage at which an electrical device has been designed to operate.
What is the voltage power current and resistance of an electrical heater?
The two most important ratings for an electrical heater are its rated power and its rated voltage, and these will be printed on a 'nameplate' fixed somewhere on the heater (e.g. '3 kW at 230 V').For the heater to operate at its rated power, it must be subject to its rated voltage. In the above example, the heater will only operate at 3 kW if it is supplied with 230 V.If you know the heater's power (P) and its voltage (U), then you can calculate the rated current (I) it will draw from the supply, using the equation: I = P/U.You can also determine its resistance (R), using the equation R = U2/P.
What is the current of a 45 kva transformer?
Presumably, you are asking what is the rated secondary current for a 45 kV.A (not 'kva') transformer? The answer depends on its rated secondary voltage. To obtain the rated secondary current, you divide the (apparent) power rating by its secondary rated voltage.
Why transformer is rated inkva?
Because it's the product of the transformer's rated secondary voltage and its rated secondary current. The product of voltage and current, in a.c., is the volt ampere.Incidentally, it's 'kV.A', not 'kva'.
What is current capacity of 1200kva genarator?
The current rating of a 16 kV.A (not 'kva') depends upon the voltage rating of that generator, with 16 kV.A being the product of the rated current and the rated voltage.
If you operate an incandescent light bulb at less than its rated voltage?
Since an incandescent light bulb is an appliance that has a fixed electrical resistance, operating it at less than its rated voltage means that it will draw less than its rated current and will produce less light.
