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AS Electricity Definitions
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Terms in this set (17)
The coulomb
The amount of charge (flowing past a point) in 1s when the current is 1A
Electric Current
Rate of flow of charge
Mean drift velocity
The average velocity of an electron as it travels through a wire in the direction of the current/due to a p.d
Conventional current
Direction in which positive charges/ion move. Opposite to the direction of electron flow
Potential difference
Energy transferred per unit charge from electrical form (into other forms, e.g. light/heat)
Electromotive force (e.m.f)
Energy transferred per unit charge into electrical form (from other forms, e.g. chemical/mechanical)
The volt
1 J (of energy transfer) per coulomb (of charge)
Resistance
R = V/I where R is resistance, V is Voltage and I is current
The Ohm
A potential difference of 1 volt per ampere
Ohm's law
The current is (directly) proportional to the p.d. / voltage as long as the temperature remains constant
Ohmic Component
A component that obeys Ohm's Law (e.g. resistor, wire)
The resistivity of a material
Correctly selected and re-arranged: ρ = RA/L; symbols defined: A = cross-sectional area, R = resistance, L = length
The kilowatt-hour (kW h)
It is the energy transferred by a 1 kW device working for 1 hour
Power
The rate of work done
Kirchhoff's first law
The sum of currents into a junction = sum of currents out of that junction
Kirchhoff's second law
Sum of e.m.f.s = sum of p.d.s (in a continuous loop in a circuit) energy is conserved
Internal Resistance
The heat energy lost inside a power source can be modelled as a resistor inside the power source. This resistance is the internal resistance.
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