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What is the definition of primary current?
Primary current is the current that flows through the primary winding of a transformer. It is the input current that flows into the transformer before being transformed into a different voltage or current in the secondary winding.
Does a fluorescent ballast use power when no bulbs are in the fixture?
Yes, there is an excitation current that flows through the primary side of the transformer which is located in the magnetic ballast's casing.
What happens to the electrical energy carried by the current when it passes through the filament of a bulb?
it stays there. the electricity travels back and forth through the filament until you turn the lighbulb off.
What is meant by ground fault?
The ground ('earth'), because of its mass, is a reasonably-good conductor and is used as a 'reference' for a distribution transformer's neutral terminal. A ground fault ('earth fault') occurs when the line conductor from the distribution transformer makes accidental contact directly with the ground ('earth'). The resulting low-resistance earth path back to the transformer's neutral is such that the resulting ground-fault current('earth-fault current') will operate the transformer's overcurrent protection device (e.g. fuse).
What is the primary purpose of a transformer?
Transformers are used to change one ac voltage into another. They only work on alternating current, not direct current. At a hydro station for example, the voltage generated is quite low, and it is increased to a few kilo-volts by a transformer for sending out on the transmission lines. That choice is made because the losses on the lines are a function of the current carried, so higher voltage = lower current = lower losses. Near the customers end of the system, the voltage is dropped down to the low hundreds of volts which helps minimize the risks to the householder. The long distance transmission lines are carrying a smaller current, so they may be made smaller, thus saving copper. But at the expense of larger insulators. Transformers are also used in their current - converting mode as well. For example, in a large factory, we don't want the thousands of amperes flowing through the meter! So a current transformer is used which (for the meter) a small but proportional current is passed to the meter.
How transformer conduct current through ground?
A transformer doesn't 'conduct current through the ground'. However, in the event of a ground fault in the circuit supplied by a grounded transformer, the resulting fault current will flow through the earth back to the grounded terminal of that transformer's secondary winding.
Why transformer action takes place in a DC circuit?
A: A transformer is a PASSIVE ac component applying dc to it the wires resistance would be the only limiter for current flow. Usually a common transformer will burn up fast or slowly depends on power applied
Why transformer rating is not given in kw?
Transformer rating is based on the maximum temperature a transformer can run at. This temperature is dictated by the amount of current flowing through the transformer windings. This is why transformers are rated in KVA (voltage * current), not kW - it doesn't matter what the phase relationship is between voltage and current, just the magnitude of the current.
Why the output voltage from a transformer is zero if a direct current flows through the primary coil?
A transformer relies on AC current flowing through the primary to set up changing magnetic fields in the core. The field flows through the core and in to the secondary of the transformer, generating an AC current. The current must be AC, otherwise the magnetic field in the core of the transformer will saturate. In the same way, the armature of a dynamo or alternator must be moving in order to create a changing magnetic field to create current through the windings.
What type of current must be used with a transformer?
DC current cannot be used in a transformer only AC will work. A transformer needs the continual build and collapse of the magnetic field to keep the iron core from reaching saturation. Only alternating current will transfer power through a transformer.
What is Primary Current?
Primary current is a flow to be measured that cannot be safely passed through the measuring device. A current transformer is used to provide a lower level, secondary current that can be passed safely through the measuring device. Primary current is measured as a secondary current, multiplied by the turns ratio in the current transformer.
What does a step-down transformer do to the electrical current?
A step-down transformer lowers the voltage of an AC current. The higher AC current is put through one side and the other side the lower AC current is delivered.
Explain differancnce between instrument current transformer and measuring current transformer?
Current transformer is a device used to measure the flow of current through a power system and the measured current is inputted to a protective relay system. It is used to detect system malfunction. Current transducer is a device used to measure AC and DC current based on the halt-effect technology.
Why doesn't a transformer work only on a DC supplyand not in ac supply?
A transformer doesn' t work with DC current because voltage is induced in the output winding of the transformer when a magnetic field passes through the coils of this winding. This happens with AC current because the magnetic field is continually expanding and contracting. With a DC current the magnetic field is unchanging other than when you first turn it on. Since the magnetic field is not moving it is not moving through the windings and no voltage is produced.
Current travels from a power plant to a transformer that increases voltage through a what?
circuit
Why less current increases in transformer than in induction motor when load is increase?
The current flowing through a transformer's secondary is the current drawn by the load, so it will be exactly the same as the current flowing through your induction motor -assuming that is the load. Don't really understand the point of your question!
What happens to electric current before it enters you home?
Before entering your home, electric current typically travels through a network of power lines and transformers to step down the voltage for safe domestic use. It may also go through a meter to measure usage before entering your home's electrical panel.
