# Physics - Unit 1 Section 3

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What is electric current?
The rate of flow of of charge through a wire or a component. The current is due to the passage of charged particles. The charged particles are referred to as charge carriers.
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What is potential difference?
energy converted per unit charge moved.
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What is the equation for current?
I = ∆Q / ∆
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What is the equation for potential difference?
P.d = W / Q
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What is the unit for charge?
Coulombs
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What is the definition of a volt?
The potential difference across a component is 1 volt when you convert 1 joule of energy moving 1 coulomb of charge through the component.
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What is the equation for resistance?
R = V / I
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What is the units for resistance?
Ohms
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What is Ohm's law?
Provided the temperature is constant, the current through the ohmic conductor is directly proportional to the potential difference across it. Only ohmic devices follow ohms law.
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What are the the charge carriers in metals?
In metals, the charge carriers are conduction electrons. They move about inside the metal, repeatedly colliding with each other and the fixed positive ions in the metal.
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What is the equation for resistance?
R = V / I
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What is the units for resistance?
Ohms
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What is Ohm's law?
Provided the temperature is constant, the current through the ohmic conductor is directly proportional to the potential difference across it. Only ohmic devices follow ohms law.
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What are the the charge carriers in metals?
In metals, the charge carriers are conduction electrons. They move about inside the metal, repeatedly colliding with each other and the fixed positive ions in the metal.
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What is the unit for current?
Amperes, A
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What are the charge carriers like in an insulator?
In an insulator, each electron is attached to an atom and cannot move away from the atom. When a voltage is applied across an insulator, no current passes through the insulator, because no electrons can move through the insulator.
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What are the charge carriers like in a metallic conductor?
Most electrons are attached to atoms but some are not, and these are the charge carriers in the metal. When a voltage is applied across the metal, there conduction electrons are attracted towards the positive terminal of the metal.
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What are the charge carriers like in a semiconductor?
The number of charge carriers increases with an increase of temperature. The resistance of an semiconductor therefore decreases as its temperature is raised. A pure semiconducting material is referred to as an intrinsic semiconductor because conducti
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What is E.M.F?
The emf of a source of electricity is defined as the electrical energy produced per unit charge passing through the source.
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What is the equation for resistance?
R = V / I
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What is the units for resistance?
Ohms
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What is Ohm's law?
Provided the temperature is constant, the current through the ohmic conductor is directly proportional to the potential difference across it. Only ohmic devices follow ohms law.
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What are the the charge carriers in metals?
In metals, the charge carriers are conduction electrons. They move about inside the metal, repeatedly colliding with each other and the fixed positive ions in the metal.
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What is the unit for current?
Amperes, A
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What are the charge carriers like in an insulator?
In an insulator, each electron is attached to an atom and cannot move away from the atom. When a voltage is applied across an insulator, no current passes through the insulator, because no electrons can move through the insulator.
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What are the charge carriers like in a metallic conductor?
Most electrons are attached to atoms but some are not, and these are the charge carriers in the metal. When a voltage is applied across the metal, there conduction electrons are attracted towards the positive terminal of the metal.
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What are the charge carriers like in a semiconductor?
The number of charge carriers increases with an increase of temperature. The resistance of an semiconductor therefore decreases as its temperature is raised. A pure semiconducting material is referred to as an intrinsic semiconductor because conducti
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What is E.M.F?
The emf of a source of electricity is defined as the electrical energy produced per unit charge passing through the source.
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What is the electrical energy produced equation?
The electrical energy produced when charge Q passes through the source = Qε
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What is the equation for charge?
Q =I x Δt
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What is the equation for work done?
W = I x V x Δt
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What is work done equal to?
Work done = power
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What is the equation for resistance?
R = V / I
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What is the units for resistance?
Ohms
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What is Ohm's law?
Provided the temperature is constant, the current through the ohmic conductor is directly proportional to the potential difference across it. Only ohmic devices follow ohms law.
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What are the the charge carriers in metals?
In metals, the charge carriers are conduction electrons. They move about inside the metal, repeatedly colliding with each other and the fixed positive ions in the metal.
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What is the unit for current?
Amperes, A
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What are the charge carriers like in an insulator?
In an insulator, each electron is attached to an atom and cannot move away from the atom. When a voltage is applied across an insulator, no current passes through the insulator, because no electrons can move through the insulator.
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What are the charge carriers like in a metallic conductor?
Most electrons are attached to atoms but some are not, and these are the charge carriers in the metal. When a voltage is applied across the metal, there conduction electrons are attracted towards the positive terminal of the metal.
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What are the charge carriers like in a semiconductor?
The number of charge carriers increases with an increase of temperature. The resistance of an semiconductor therefore decreases as its temperature is raised. A pure semiconducting material is referred to as an intrinsic semiconductor because conducti
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What is E.M.F?
The emf of a source of electricity is defined as the electrical energy produced per unit charge passing through the source.
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What is the electrical energy produced equation?
The electrical energy produced when charge Q passes through the source = Qε
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What is the equation for charge?
Q =I x Δt
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What is the equation for work done?
W = I x V x Δt
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What is work done equal to?
Work done = power
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What is the equation for power?
Power = energy/time I x V x Δt / Δt = I x V P = I x V
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What is resistance?
The resistance of a component in a circuit is a measure of the difficulty of making current pass through the component. Resistance is caused by the repeated collisions between the charge carriers in the material with each other and with the fixed pos
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What is the definition of resistance?
The resistance of any component is defined as: the p.d across the component / the current through it
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What is the equation for resistance?
R = I / V
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What is the equation for resistance?
R = V / I
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What is the units for resistance?
Ohms
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What is Ohm's law?
Provided the temperature is constant, the current through the ohmic conductor is directly proportional to the potential difference across it. Only ohmic devices follow ohms law.
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What are the the charge carriers in metals?
In metals, the charge carriers are conduction electrons. They move about inside the metal, repeatedly colliding with each other and the fixed positive ions in the metal.
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What is the unit for current?
Amperes, A
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What are the charge carriers like in an insulator?
In an insulator, each electron is attached to an atom and cannot move away from the atom. When a voltage is applied across an insulator, no current passes through the insulator, because no electrons can move through the insulator.
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What are the charge carriers like in a metallic conductor?
Most electrons are attached to atoms but some are not, and these are the charge carriers in the metal. When a voltage is applied across the metal, there conduction electrons are attracted towards the positive terminal of the metal.
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What are the charge carriers like in a semiconductor?
The number of charge carriers increases with an increase of temperature. The resistance of an semiconductor therefore decreases as its temperature is raised. A pure semiconducting material is referred to as an intrinsic semiconductor because conducti
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What is E.M.F?
The emf of a source of electricity is defined as the electrical energy produced per unit charge passing through the source.
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What is the electrical energy produced equation?
The electrical energy produced when charge Q passes through the source = Qε
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What is the equation for charge?
Q =I x Δt
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What is the equation for work done?
W = I x V x Δt
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What is work done equal to?
Work done = power
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What is the equation for power?
Power = energy/time I x V x Δt / Δt = I x V P = I x V
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What is resistance?
The resistance of a component in a circuit is a measure of the difficulty of making current pass through the component. Resistance is caused by the repeated collisions between the charge carriers in the material with each other and with the fixed pos
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What is the definition of resistance?
The resistance of any component is defined as: the p.d across the component / the current through it
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What is the equation for resistance?
R = I / V
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What is a superconductor?
A superconductor is a wire or a device made of material that has zero resistivity at and below a critical temperature that depends on the material.
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What are the uses for superconductors?
Superconductors are used to make high-power electromagnets that generate very strong magnetic fields and power cables that transfer electrical energy without wasting energy.
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### Card 2

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What is potential difference?

#### Back

energy converted per unit charge moved.

### Card 3

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### Card 4

#### Front

What is the equation for potential difference?

### Card 5

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What is the unit for charge?