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Electromagnet current of o5 a supply is 12v what resistance does the electromagnet have?
Wiki User
∙ 13y ago
If you mean current , I = 5A & potential difference, V = 12V
According to ohms law,I = V/R ,which means R = V/I = 12/5 = 2.4 Ω
Wiki User
∙ 13y ago
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How is a electromagnet diffrent then a permanent magnet?
By definition an electromagnet is only working when it has a supply of electricity, a Permanent Magnet is always a magnet
The polarity of an eletromagnet is determined by the?
the way in which the positive & negative terminals on the battery or power supply are attached to the electromagnet. switching the leads from the positive terminal to the negative one, and the negative one to the positive terminal should reverse the polarity of your electromagnet.
Advantage of using electromagnet in an electric motor rather than a permanent magnet?
convert electrical energy to energy of motion...! the usage of an electromagnet allows us to control the flow of electrons to the electric rotor,thereby allowing us to control the working of the rotor,whereas with a permanent magnet there will be a continuous supply of energy which can be stopped only if the magnet is damaged or heated.
What is lost volts?
A battery is rated to supply a certain number of volts. However, it actually supplies less, because they are "lost" as the current has to get out of the battery in the first place.(The battery has internal resistance)The amount of lost volts depends on the current being drawn:The less resistance a circuit has, the more current is drawn, because it's easier to flow.Example:If the circuit has little resistance, it draws a large current and the battery's internal resistance causes more lost volts.If the circuit has high resistance, it draws a small current and there are fewer lost volts.This is why when you short-circuit a battery (give it hardly any resistance to go through) it heats up and may explode. A large current is drawn and all the volts are used by the battery's internal resistance.
What is the resistance of a 10W bulb?
If you're using it in your home with a voltage supply of 230V [Basically speaking], the resistance would be around 5290Ω. The following equations can help you: P=V*I {Where P is the power, V is the voltage and I is the current} V=I*R {Where R is the resistance}
When would an electromagnet stop working?
An electromagnet would stop working if the electrical current flow is interrupted or if the power supply is disconnected. Additionally, if the coil overheats, it can damage the insulation and cause the electromagnet to fail.
How is a electromagnet diffrent then a permanent magnet?
By definition an electromagnet is only working when it has a supply of electricity, a Permanent Magnet is always a magnet
How do you turn off an electromagnet?
This is what makes a magnet an electromagnet - the ability to turn it on and off... Anyway, electromagnets can be turned off with either the help of a switch, or just by disconnecting the power supply.
What is the source of electricity in the electromagnets?
The source for an electromagnet can be any electrical supply. Batteries or derived from the mains, using a transformed and rectified supply.
What materials do i need to make an electromagnet?
A nail, copper wire, paper clips, staples and power supply.
What is the difference between magnets and electromagnet?
an electromagnet is a magnet which is activated by electricity and it ceases to be a magnet once the electric supply is stopped whereas a magnet is a natural magnet which does not need electricity and continues to be a magnet whether it is supplied by electricity or not.
The polarity of an eletromagnet is determined by the?
the way in which the positive & negative terminals on the battery or power supply are attached to the electromagnet. switching the leads from the positive terminal to the negative one, and the negative one to the positive terminal should reverse the polarity of your electromagnet.
How can the current on an electromagnet increase?
Yeah buddy - until something smokes. It does, and so does increasing the amp supply but you have to be careful not to melt the wire. Preferably you should increase both. -Good Luck Note; You automatically increase the amps being used by increasing the voltage applied.
How strong is a electromagnet?
Well, it depends on the core you use, the thickness of the wire, how much the wire is coiled around the core, and especially the power supply.
What are the components of an electromagnet?
Coil and core, and you'll need a power supply to activate it.
When add resistance to an electrical parallel circuit the amperage will?
The new resistance will draw an additional branch current, resulting in an increase in the supply current. Another way of looking at it is, when you add additional resistance, the overall resistance will reduce, increasing the value of the supply current.
What materials are needed to make an electromagnet?
-- a DC power supply; (e.g., battery) -- a long conductor that can be arranged to take the current several turns around a central axis; (e.g., wire) -- a highly permeable core for the winding; (e.g., cylindrical clump of iron)
