Term
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Definition
| quantity of charge which passes when a current of 1 ampere passes for a time of 1 second |
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Term
| What is the value of the elementary charge? |
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Definition
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Term
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Definition
| At constant temperature, the voltage of a conductor is directly proportional to it's current |
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Term
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Definition
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Term
| Define Current along with it's formula (2 points) |
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Definition
Rate of flow of charge
Q = I * t |
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Term
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Definition
| The fundamental SI unit of Current |
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Term
| State Kirchhoff's first law, and is a consequence of ____ |
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Definition
the sum of current entering a junction is equal to the sum of currents leaving a junction
-consequence of conversion of charge |
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Term
| State Kirchhoff's second law, and is a consequence of ____ |
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Definition
In any closed circuit, the sum of all p.d.s is equal to the sum of all e.m.f.s
-consequence of conservation of charge |
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Term
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Definition
property of a component that regulates the electrical current though it
measured in ohms |
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Term
| Define Electromotive force |
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Definition
| is the energy transferred per unit charge when one type of energy is converted into another form of energy |
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Term
| Define Potential difference |
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Definition
| is the energy transferred per unit charge when electrical energy is converted into another form of energy |
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Term
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Definition
is defined as p= RA / l
where;
p= resistivity
R= cross sectional area
A= cross sectional area
l= length of wire |
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Term
| Define Internal resistance |
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Definition
| resistance of an e.m.f. source (due to the chemicals in the cell or battery) |
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Term
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Definition
| total p.d. across the load external resistance |
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Term
| I-V characteristic of a LED |
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Definition
- near infinite resistance before 0.6 V
- resistance decreases as voltage increases after 0.6 V |
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Term
| I-V characteristic of a Filament lamp |
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Definition
| Resistance is proportional to voltage until it reaches 1.5 V wherein the resistance increases as the Temperature increases |
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Term
| I-V characteristic of a fixed resistor |
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Definition
| straight diagonal line that goes through the origin |
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Term
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Definition
| Rate at which work is done |
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Term
Unit of:
a. power
b. energy |
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Definition
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Term
| Define a progressive wave |
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Definition
| waves that move away from a source |
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Term
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Definition
| the direction of oscillation is perpendicular to the direction of propagation |
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Term
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Definition
| direction of oscillation is parallel to the direction of propagation |
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Term
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Definition
| distance from a point in the wave to the mean value |
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Term
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Definition
| maximum displacement from the mean |
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Term
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Definition
| the amount of complete oscillations within a given unit of time |
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Term
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Definition
| smallest distance between one point on a wave and the identical point on the next wave |
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Term
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Definition
| Time taken to complete one full oscillation |
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Term
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Definition
| amount by which one oscillation lags/leads behind another measured in rads |
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Term
| Relationship of INtensity and Amplitude |
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Definition
| Intensity is directly proportional to amplitude^2 |
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Term
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Definition
| occurs when a wave bounces back from the surface of an obstacle |
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Term
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Definition
| occurs when the wave enters a different medium with a higher density than air and changes direction and speed |
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Term
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Definition
| The spreading of waves when they pass though a aperture or around an object |
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Term
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Definition
| process of converting an unpolarised wave into a polarised wave |
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Term
| How would you conduct a experiment to see the polarisation of microwaves (3 marks) |
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Definition
| Two polarising filters placed between transmitter and receiver that are facing each other [1]. Start with both filters being parallel to each other, which allows microwaves through freely, then twist the second filter through 90 degrees and observe the drop in detection until 0 [1]. This shows that the microwaves must have been polarised through the first filter, otherwise detection would have been equal throughout the rotation. [1] |
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Term
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Definition
| A physical law that describes the cgane in intensity of a wave passing though a polaroid analyser |
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Term
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Definition
| the superposition of 2 or more waves that result in a new wave pattern |
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Term
| How can a wave be coherent? |
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Definition
| coherent waves arewaves that have the same frequency and a constant phase difference |
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Term
| Constructive interference |
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Definition
| occurs when two waves that are in phase reinforce |
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Term
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Definition
| occurs when two waves that are antiphase cancel each other out |
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Term
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Definition
| Light that has the same wavelength |
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Term
| How is a stationary wave formed? |
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Definition
| A stationary wave is formed when two coherent waves that are travelling in opposite directions superpose |
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Term
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Definition
| a node is a spot where the displacement is always zero due to destructive interference |
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Term
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Definition
| an antinode is a spot where the amplitude is maximum due to constructive intereference |
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Term
| Define Threshold frequency |
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Definition
| Frequency of elctromagnetic radiation that will result in an emmision of photoelectrons from a specified metal surface |
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Term
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Definition
| Energy charge of an electron as it moves through a potential difference of 1 volt |
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Term
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Definition
| energy required to move an electron from it's surface |
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Term
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Definition
| The Potential difference required to stop the movement of electrons in a closed circuit |
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