Asked in Home ElectricityElectronics EngineeringUnits of MeasureAppliance Voltage and Travel Issues
Units of Measure
Appliance Voltage and Travel Issues
What are the units of measurement for current load and amperage?
What size breaker should be used for a circuit?
A breaker is sized indirectly by the load current. The breaker is used to protect the wire from being overloaded by amperage. Wire is sized by the load amperage. The procedure is, use the load amperage to find the correct wire size that will carry that amperage safely. Size the breaker so that the amperage on the wire doesn't exceed the rated capacity of the sized wire. The only time a breaker is over sized above the wire's rating is when a motor is connected into the circuit. Then the breaker is over sized by 250% of the motors full load amperage. This is to compensate for the starting current of the motor which can get as high as 300% above the motor's run current.
Asked in Home Electricity, New Electrical Work
If my AC technician says my unit is rated at 28.9 amps and drawing 24.8 and should draw about half of rated capacity and that compressor needs to be replaced Is this correct?
There are several amperage ratings on AC compressors/motors. Locked Motor Amperage (LRA) is the amperage that the motor is fused for. The load of the motor is expressed in amperage or wattage, which is probably the case here. Low amperage readings on an AC unit being charged by amperage load would indicate low freon. High amperage readings indicate overcharge when charging by the amperage load. AC units are not accurately charged by amperage readings and the efficiency of motors is not expressed in amperage readings.
Asked in Science, New Electrical Work
What is the amount of current flow through a wire?
The amount of current flowing through a conductor is governed by the amperage of the connected load. This is why there are different sizes of conductors. Each conductor size is only allowed a specific amount of amperage to flow through it. If the amperage load is higher that what the conductor is rated for then the next larger size conductor has to be used. The limiting of the amperage to specific size conductors keeps the conductor from heating beyond the conductors specifications, under full amperage conditions.
Should current increase as voltage decreases?
Yes. As long as the load stays the same. Voltage equals the resistance of the load times the current or amperage. Or , in this case, as an example, if the load is the same, the voltage is 240 and current is 10 amps. At 120 volts, the current is 20 amps. Current x resistance(or the load)=voltage. With simple math, the equation can be moved around.
Asked in Home Electricity, Electrical Engineering
Can the amperage of a DC current be increased keeping the voltage constant?
What is the full load current rating of a 3 phase 3 hp 220 volt motor?
The code book stated amperage for a three phase three HP 220 volt motor is 9.6 amps. This amperage is for calculation purposes only. The motors actual nameplate amperage should always be used to calculate wire and breaker sizing. Remember that the breaker for a motor has to be 250% of the motors full load amperage. The wire size has to be sized at 125% of the motor's full load amperage.
What is current in India I know voltage is 220-240 what is the current in amps?
What is the current in a single phase in 220 volt 3 phase system?
Asked in Home Electricity
What size of wires to be used for branch circuit?
The size of branch circuits is directly related to the amperage draw of the load. The load amperage governs the size of the conductors that are used to feed the load. Also by the same token, the breaker that feeds the supply voltage is governed by the amperage draw of the load. So to answer the question, the wire sizes could be any number of different sizes depending on the amperage they have to carry.
How do you calculate cable size for 5kw load calculation?
Without knowing the nominal voltage, you cannot determine the load current and, therefore, cannot determine the cable size. <<>> The sizing of cables or conductors is based on the amperage that the conductor can safely carry. The formula for amperage is I = W/E. Amps = 5000/Volts. With out a voltage stated an answer to this question can not be answered. When you calculate the amperage, re-ask your question for a conductor size for a given amperage.
What size breaker do you need for a well pump?
Asked in Cars & Vehicles, Car Batteries
What component in a battery governs current flow?
Can you reduce amperage by using thicker wire with a constant voltage?
The amperage flowing through a wire is directly related to the load placed on the circuit, and has nothing to do with wire size, except that a larger wire will carry more amperage. Increasing wire size will not lower amperage but will allow the circuit to carry more amperage if the breaker is also increased in size. No. Ohm's law tells us that V = IR. For a given load, R is constant, and thus the only way to reduce current is to increase voltage.
Asked in Electrical Engineering
How thick is the cable to conduct 22.5 kw of power?
Cable doesn't conduct power, it conducts current. Either the voltage and load must be known or the amperage the cable will need to conduct to determine the size of the cable. Once the amperage is known, there are multiple tables online that have cable size and amperage. Do a Google search for "conductor amperage" for examples.
How many amps does a 96 volt 1 HP DC motor put out?
Does using a higher than necessary ampacity in electrical circuits cause a higher electrical meter reading?
No, the electrical meter reads watts by multiplying the voltage and the amperage used in electrical circuits. Using oversize wire does not govern the amperage flow to the load. The load resistance in the circuit is what governs the amount of current that flows through the wire. This current in the load circuit is multiplied by the voltage applied to the circuit at the electrical meter. The product of this multiplication is wattage, multiplied by the amount of time the load is on, is what the electrical utility bill is based on.