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18 Cards in this Set
- Front
- Back
- 3rd side (hint)
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Current |
Rate of flow of charge |
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I |
∆Q/∆t |
Q |
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1 Coulomb |
The charge flowing past a point in one second when the current is 1 amp |
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e |
1.6x10^-19 |
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Conventional Current |
Positive to negative |
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Electron Flow |
Negative to Positive |
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Kirchoff 1 |
The sum of the currents into a fixed point must be equal to the sum of the currents out of that point |
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Number Density |
Number of free electrons per m^3 |
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Mean Drift Velocity |
Electrons randomly hit the metal ions, giving them a random velocity. The electrons will drift towards the positive end of the power supply. The distance travelled per unit time is equal to the mean drift velocity. |
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Volt |
The energy each unit of charge transfers whilst passing through the component OR The work done by the charge carriers on the component |
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EMF |
Is the work done on the charge carriers by the cell |
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Electron Gun |
1) Filament heated (in vacuum) 2) Emits electrons (thermionic emission) 3) P.D. applied between filament (cathode) and anode 4) Free electrons accel towards anode gaining Ek 5) If hole in anode, a beam with electrons of specific wavelength emitted |
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I |
Anev |
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eV |
1/2mv^2 |
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Resistance |
Ratio of the potential difference and the current |
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R |
V/I |
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Ohm |
The resistance of a component when a PD of 1V is produced per amp of current |
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Ohm's Law |
For a metallic conducted at constant temp, current and P.D are directly proportional |
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