Please enable JavaScript.

Coggle requires JavaScript to display documents.

current/ DC electricity, DC / current electricity (DC electricity…

- - - - components/converters
        
        resister
        
        lamp
        
        switch
        
        rheostat (variable)
        ( - all converters convert
        electrical energy into
        another form of useful energy)
      - Meters (ways of measurement)
        
        Ammeter (A), measures current
        (connected in series)
        
        Voltmeter (V), measures voltage
        (connected in parallel)
        
        Ohmetere (O), measures resistance
      - (some definitions)
        - cells, batteries, power packs
        & mains = provide electrical energy
        (they are all sources of E.E)
        
        switches = close or brake
        a circuit, enabling charge
        to flow through
        
        Fuse = (safety device), breaks
        the circuit when it gets to hot
      - sources of electrical energy/charge:
        
        single cell
        
        3 cells in series
        
        battery of cells
        
        power pack
- - - - current is the same everywhere in a series circuit
        = because electrons flow in 1 closed loop,
        so the rate of flow is the same everywhere
      - current devides between branches in parrallel circiuts
        = becase the flow of electrons must devide
  - - - voltage is the difference in electrical energy
        between 2 points,
        (when 1 coulomb of charge moves
        between those to points)
      - Unit of P.d = volts (V)
        1V = 1000MV (millivolts)
      - V = E/q
        V = p.d. / volatge (V)
        E = change in electrical energy (J)
        q = charge (C)
      - Electrical energy provided = electrical energy used up
        e.g. the energy provided from the source
        = energy provided to each coloumb,
        then electrical energy converted to light energy
        & used by the lamp
        10V = 10V
    - - as electrons flow around the circuit,
        they give up their energy to the converters
        (converters always take the same amount of
        energy from each coulomb flowing through it)
      - voltage at the
        converter vs source
        
        voltage of the converters = the amount of energy a
        converter takes away/uses from each coulomb
        
        voltage of the source = the amount of energy given to each coulomb
      - series vs parallel:
        
        voltage in series:
        
        converters are connected in series
        
        current / coulombs must give energy to the converter
        
        voltage of the converters will add up to the voltage of the source
        V tot. = V1 + V2 + V3
        
        voltage in parallel:
        
        converters are connected in parallel
        
        the coulomb in the circuit are split among branches so each electron/ coulomb goes through only 1 branch
        
        all the energy of the coulomb will be given up to that branch/converter
        
        voltage of each branch/converter = the same as the voltage of
        the source
        V tot. = V1 = V2 = V3
  - - - Series:
        total resistance increase
        total current decrease
        all converters contribute to the total circuit resistance
        (because there is only 1 branch, the current must go through and be resisted by every converter)
        R tot. = R1 + R2 + R3
      - Parallel:
        total resistance decreases
        total current increases
        the more branches = the smaller the circuits total resistance, = therefor greater total current drawn from the source
        (because each branch draws its own current)
        branch with the greatest resistance = has the smallest current
        R tot. < resistance of the branch with the lowest resistance
    - - Current:
        
        the current from the source = depends on the
        total amount of resistance in the circuit
        
        greater the circuit resistance...
        ... the smaller the current
        (& visa versa)
        (current is inversely proportional to resistance)
      - Voltage:
        
        voltage of each converter = depends on the
        resistance of the particular converter
        
        greater the resistance...
        ... greater the voltage
        (voltage is proportional to resistance)