Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
18 Cards in this Set
- Front
- Back
- 3rd side (hint)
Current |
Rate of flow of charge |
|
|
I |
∆Q/∆t |
Q |
|
1 Coulomb |
The charge flowing past a point in one second when the current is 1 amp |
|
|
e |
1.6x10^-19 |
|
|
Conventional Current |
Positive to negative |
|
|
Electron Flow |
Negative to Positive |
|
|
Kirchoff 1 |
The sum of the currents into a fixed point must be equal to the sum of the currents out of that point |
|
|
Number Density |
Number of free electrons per m^3 |
|
|
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. |
|
|
Volt |
The energy each unit of charge transfers whilst passing through the component OR The work done by the charge carriers on the component |
|
|
EMF |
Is the work done on the charge carriers by the cell |
|
|
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 |
|
|
I |
Anev |
|
|
eV |
1/2mv^2 |
|
|
Resistance |
Ratio of the potential difference and the current |
|
|
R |
V/I |
|
|
Ohm |
The resistance of a component when a PD of 1V is produced per amp of current |
|
|
Ohm's Law |
For a metallic conducted at constant temp, current and P.D are directly proportional |
|