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When do you use Power Factor?
You use power factor when the load is not resistive, i.e. when it is reactive, and the phase angle between voltage and current is not zero.
Can you use an AC contactor in the place of DC contactor?
No, you definitely cannot.
Can you use electronic circuit as a load?
If you are just using the load to pull a small amount of current, then yes a electronic circuit can be used for that. If you want a resistive load to measure voltage drop or something similar, then no an electronic circuit will usually not work for that.
Which relay is used to control 3 phase induction motor?
Overloads for motors are sized from the full load amperage that is taken from the motors nameplate. Depending on who the manufacturer of the motor contactor is will govern the sizing of the relay. Some contactors use bolt in heaters and others use a separate unit that connects to the contactor. No matter what method is used make sure to use the manufactures recommended overloads that are based in the motors FLA.
What are 4 examples of electrical loads?
Anything that uses electricity. For example, a light-bulb.
Do air conditioners use resistive load or inductive load?
resistive loadAnswerIf the current is driving a motor, then the load is resistive-inductive.
How does magnetic contactor operate?
explain me about the contactor works with examples. if i want to control a motor with contactor. and how i can use contactor in loops with over load and circuit breakers.
What is the Difference between resistive and capacitive load?
when a resistive load is applied there is no phase angle difference between voltage and current. when a inductive load is applied there is phase difference between voltage and current. current lags voltage by an angle of 90 degrees for pure inductive load
What electrical appliances don't use magnets?
Any appliance that has a resistive load to operate, such as a toaster or an electric iron.
When do you use Power Factor?
You use power factor when the load is not resistive, i.e. when it is reactive, and the phase angle between voltage and current is not zero.
What relay would you use to switch 400 watts of fluorescent lights?
There are special contactor that are made to switch lighting loads. These relays and not wattage rated but amperage rated. Use the following formula with the voltage that you are going to use to find the size of contactor that you need. I = W/E, Amps = Watts/Volts.
How do electro pneumatic contactors work?
A contactor is an electrically controlled switch (relay) used for switching a power circuit. an electro pneumatic contactor is similar to the above except it uses a pneumatic signal to initiate the switching of the electric power circuit. an electro magnetic contactor is a contactor driven by an electric control signal. It us usually just called a contactor.
Can you use an AC contactor in the place of DC contactor?
No, you definitely cannot.
How many phases does a 2 pole contactor have?
Yes, as long as the amperage rating is sufficient. Just don`t wire the second pole until the first pole contacts are spent. Then move the wires over and you effectively get twice the life out of it.
Can you use electronic circuit as a load?
If you are just using the load to pull a small amount of current, then yes a electronic circuit can be used for that. If you want a resistive load to measure voltage drop or something similar, then no an electronic circuit will usually not work for that.
How many watts equal one amp at 440 volts?
Watts = Amps x Volts x Power Factor Power factor varies from 0 to 1 with 1 being a pure resistive load like a light bulb. A motor would have a lesser value. So if your load is resistive just use 1 x 440.
What size fuse would you use for a circuit that carries a current of 315 amps?
Fusing depends on the load characteristics. If the load is a motor then the fusing is higher to allow the motor inrush to start the motor and not trip the fuse protection. Resistive loads are usually fused at the wire ampacity allowed for that load current.
