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Definition
The electric force between two point charges q and Q is given by
F= kqQ/r^2 |
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| Electric force experienced by charge from electric field |
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Term
| Electric field at a point |
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Definition
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Definition
V = W/Q
Measured in Volts, or JC^-1 |
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| Potential energy of charge |
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Definition
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| Electric field between parallel plates |
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Definition
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Definition
1 eV = 1.6 x 10^-19 C x 1 V
Electron charge per 1 volt of potential |
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| A charge q in an electric field of magnitude E will experience a force of magnitude... |
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| Equation for work done in moving a charge q across a potential difference V (delta V) |
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| Law of conservation of charge |
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Definition
1/2mv^2 + qV (A) = 1/2mv^2 + qV (B)
Left hand side is A, right hand side is B |
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Definition
| The work per unit charge required to bring a positive test charge from far away to the point of interest. (Volts or JC-1) |
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| Equation for potential difference |
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Definition
Work that must be done to bring a charge q from point A to point B is
W = q x (Vb - Va) |
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Term
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Definition
The amount of charge that moves through the cross-sectional area of a wire per unit interval of time.
I=Q/t |
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| Motion of electrons in current |
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Definition
| Electric field forces electrions to drift in one direction - overwhelming the electrons that collide with atoms and ions from the conductor itself, forcing them to 'drift' in one direction. This is current. |
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Term
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Definition
Potential difference across its ends divided by the current flowing through it. Given by:
R = V/I |
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Term
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Definition
When the temperature of a metallic conductor is kept constant, the current through the conductor is proportional to the potential difference across it.
I ∝ V
Graph of this will be straight line passing through origin. |
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Term
| Relationship between Resistance, Length and Area |
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Definition
R ∝ L/A
The electric resistance of a wire is proportional its length L, and inversly proportional to the cross-sectional area A. |
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Term
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Definition
The phenomena that occurs when electric current passes through a resistor; the potential at a point afterward is less than at a point before.
V = IR can be used to find this. |
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Term
| Equation(s) for Electric Power |
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Definition
P = VI
P = RI^2
P = V^2 / R |
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Term
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Definition
Ratio of work done by non-electrical forces, W, to a quantity of charge q that moves from one terminal of the battery to the other.
Measured in Volts. emf = W/q |
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Term
| Resistances of series circuits |
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Definition
Are added up; R-total = R1 + R2 + R3 + ...
Can be replaced with one large resistor of R - total |
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Term
| Resistances of parallel circuits |
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Definition
Circuit splits for the seperate paths with resistors. Law of conservation of charge means charge is same at beginning and end of split.
1/R-total = 1/R1 + 1/R2 + 1/R3 + ... |
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Term
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Definition
| Devices used to measure the current (amperes) in a circuit. They must be in series to resistors, and must have zero resistance to work effectively (ideal). |
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Term
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Definition
| A device used to measure the potential difference across a resistor. It must be connected in parallel to the resistor. Ideally, it should have infinite resistance; to take no current when connected to a resistor. |
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Term
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Definition
A device that is used to determine the current-voltage characteristic of some device with resistance R.
Can affect the amount of current going from different parts of the circuit through adjustment. |
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