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Module 4 Electricity
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Gravity
OCR A Physics AS level
Terms in this set (24)
Current
Rate of flow of charge
Coulomb
One coulomb is the electric charge flowing past a point in one second where there is current of one Ampere
Net charge on and object
Plus or minus n e
Quantisation
Charge on an object is quantised as charge can I me have certain values and must be integer multiples of e
Conventional current
When the current in a circuit flows from the positive terminal to the negative terminal
Mean drift velocity
The average velocity of the Carrier charge as it travels through a wire
Current depends on
The mean drift velocity
In I = A N E V
Current will double if either n or A or V is doubled
Potential difference
Measured across a component is the energy transferred per unit charge
Electromotive force
Energy gained per unit charge
Resistance
Is the potential difference divided by the current
Resistance
A component has a resistance of 1 Ohms of a p D of 1 volt makes a current of 1 Ampere flow though it
Ohms law
I'd the physical conditions remain constant the current through a conductor is directly proportional to the potential difference across it
Resistivity is dependent on
The temperature (if the temperature increases the Resistivity increases)
Resistivity of metals
Is lower that semi conductors
Power
Rate of transfer of energy or the rate of doing work
Kilowatt hour
Unit for energy that is 1000 Watts for 3600 seconds
Cost of electrical energy
No of units times the price per unit
Kirchhoff's first law
Charges cannot be created or destroyed
Kirchhoff's second law
Sum of the E.M.F is equal to the sum of the P.D in a closed loop so when these to things are equal the energy is conserved
Series circuits
Current is the same every where
E.M.F is split
Resistance is added up
Parallel circuits
Current is split
p.d is the same across all junctions
Internal resistance
Internal resistance of a source of emf is the the resistance to the current of the materials inside
Terminal P.d
The p.d recorded across the terminals of a cell
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