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The force that makes electrons move is a voltage, or potential difference and both are measured in Volts. When electrons move, the rate of movement is current, measured in Amps. The amount of current is dependant on both the resistance in a circuit and the voltage. The higher the resistance, the lower the current. The higher the voltage, the greater the current.
The symbol for voltage is "V" and confusingly, the symbol for current is "I". The unit of resistance is the Ohm with the symbol "R" or the Greek symbol for omega.
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How does an electric current flow?
The very word current means 'flow'. Electric current is the flow of electric charges. There are two kind of electric charges. Scientists considered the electric current as the flow of positive charges. But in case of solid metals, only negatively charged electrons are able to move freely where as the positively charged protons are held firmly within the core of the atoms. So electric current is due to negatively charged electrons. Now we have to differentiate these two. How? Let us consider the current due to flow of positive charges as conventional current flow. Hence conventional current direction is always opposite to the direction of flow of electrons. To keep the charges in motion we need a force to push them. So we use a chemical cell which has electrical potential difference between the two terminals. This potential difference is named as " electro motive force", in short "emf". So emf is responsible to make electric charges to flow.
What are 3 factors which affect the magnitude of magnetic force on current-carrying conductors?
Electric current, magnetic field intensity, length of the conductor, angle between the electric current and magnetic field
In an electric circuit what provides the push?
You could consider the Voltage as the pushing force in a circuit. It drives the current.
What is the difference between charge and current?
An electric charge can be either negative or positive. The smallest quantity of negative charge is the amount represented by one electron, and this is exactly equal to the amount of positive charge represented by one proton. In practice, charge is measured in coulombs (C). Normally, atoms have identical numbers of protons and electrons, so atoms are normally neutral. Atoms that are charged are called 'ions'. A 'positive ion' has an overall positive charge, which means it has more protons than electrons. A 'negative ion' has an overall negative charge, which means it has more electrons than protons. 'Free electons' are negatively-charged sub-atomic particles that have become detached from an atom. Most metals have an abundance of free electrons, and it is a drift of these free electrons that constitute an electric current. In electrolytes (conducting fluids) a current is usually a movement of positive or negative ions. In both cases, an electric current is a drift of electrical charge. An electric current is measured in amperes (A). The ampere is an SI base unit, and defined in terms of the force between parallel, current-carrying conductors, due to their magnetic fields. A coulomb is an SI derived unit, defined in terms of current and time, as an ampere second.
What is a current in a circuit measured in?
ampsAnswerElectric current is measured by means of an ammeter. Electric current is expressed in amperes (symbol: A), which is defined in terms of the magnetic effect of an electric current -i.e. the force between two, parallel, current-carrying conductors.
What is definition of electric current?
Current is the motion of electrons in a conductor being propelled by electromotive force (voltage).
What is an electical current?
Electric current is simply the flow of free electrons in a conductor. It is usually defined as the rate of charge flow, because the free electrons represent an electric charge.
What force makes electrons move?
Electrons move in response to an electric force, which is generated by a difference in electric potential. This force causes electrons to flow from areas of high potential (positive) to areas of low potential (negative), creating an electric current.
What unit measure the force that makes electron move in a electric current?
The force that causes electrons to move in an electric current is measured in volts, which is the unit of electrical potential difference. The flow of electrons is driven by this voltage, creating the current in the circuit.
What is the driving force which causes electrons to flow through conductors called?
That force is called an 'electric current'.
Can moving electrons through a magnetic field can produce an electric current?
Yes, a moving electron in a magnetic field can induce an electric current. This is the principle behind electromagnetic induction, where a changing magnetic field induces an electric current in a conductor.
What is the force that causes electrons to move in a conductor?
The force that causes electrons to move in a conductor is an electric field created by a voltage difference across the conductor. This electric field exerts a force on the negatively charged electrons, causing them to flow in the direction of the electric field.
What is the force which drives an electric current through a conductor?
An electric current is driven through a conductor by the force of voltage or potential difference applied across the ends of the conductor. This force pushes the free electrons in the conductor, causing them to move in a particular direction, thus creating an electric current flow.
In which direction does the electric force act on electrons?
The electric force acts in the opposite direction of the electric field on electrons.
What happens before electric current is created?
An electric current is the result of a voltage. Considering the individual charged particles (often these are electrons), they must be subjected to electric forces - for typically an attractive force to one side, and a repulsive force to the other.
What creates an electric force field that moves electrons through a circuit?
An electric potential difference, also known as voltage, creates an electric force field that moves electrons through a circuit. Electrons flow from areas of high potential (voltage) to areas of low potential, creating an electric current in the circuit.
What causes an electric current to keep moving?
An electric current keeps moving because of the presence of an electric field. The electric field exerts a force on the charged particles (usually electrons) in the conductor, causing them to continue moving. In a closed circuit, the movement of electrons from the negative to the positive terminal of the power source ensures a continuous flow of current.
