Physics: Module 4 - Electrons, Waves and Photons

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What is current?
The rate of flow of charge
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What is the formula for current in terms of charge?
I = ΔQ/ΔT, current = change in charge / change in time
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What is the unit of charge?
The columb, C
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What is 'e'?
The elementary charge, 1.6x10^-19C
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What is the net charge on a particle represented in?
Factors of the elementary charge
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What is current?
The movement of electrons in a metal or the movement of ions in an electrolyte
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What is conventional current?
Conventional current goes from positive to negative
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What is electron flow?
Electron flow is the flow of charge from negative to positive
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State Kirchhoff's first law
The sum of current before a junction is equal to the sum of current after a junction
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What is Kirchhoff's first law a result of?
Conservation of charge
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What is the mean drift velocity formula?
I = Anev
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What is 'n' in the mean drift velocity formula?
The number density of charge carriers
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What is the number density of conductors like?
High
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What is the number density of insulators like?
Low
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What is potential difference?
The difference in electric potential between two points per unit charge
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What is the unit for potential diference?
The Volt, V
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What is the unit for E.M.F?
The Volt, V
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What is the difference between E.M.F and potential difference?
E.M.F is the energy transferred by the battery from chemically stored energy into electrical energy, whereas potential difference is the change in electrical energy into other forms (light, heat, etc.)
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What is the formula for energy transfer in terms of charge?
W = VQ or W = ƐQ. work done = voltage (or E.M.F) x charge
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What is resistance?
the measure of the degree to which a conductor opposes an electric current through that conductor
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What is the formula for Ohm's Law?
V = IR, voltage = current x resistance
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What is Ohm's Law?
Voltage and current are directly proportional provided all internal conditions, including temperature, remain constant.
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What are the IV characteristics of Ohmics conductors
Directly proportional (straight line that passes through origin)
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Name some non-Ohmic conductors
Filament bulb, diode, thermistor, light dependent resistor
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How does the resistance change if light intensity changes on a LDR?
Resistance increases and intensity increases
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What is the formula for resistivity of a material?
R = ρL/A, resistance = (resistivity x length) / area
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Other cards in this set

Card 2

Front

What is the formula for current in terms of charge?

Back

I = ΔQ/ΔT, current = change in charge / change in time

Card 3

Front

What is the unit of charge?

Back

Preview of the front of card 3

Card 4

Front

What is 'e'?

Back

Preview of the front of card 4

Card 5

Front

What is the net charge on a particle represented in?

Back

Preview of the front of card 5
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