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5124689
Voltage, Current and Resistance
Descripción
GCSE Physics Mapa Mental sobre Voltage, Current and Resistance, creado por Alice Hathaway el 13/04/2016.
Sin etiquetas
physics
gcse
Mapa Mental por
Alice Hathaway
, actualizado hace más de 1 año
Más
Menos
Creado por
Alice Hathaway
hace alrededor de 8 años
25
1
0
Resumen del Recurso
Voltage, Current and Resistance
Series Circuit
Voltage
Shared across all components
V = V1 + V2
Voltage around always adds up to voltage across the battery
Total work done on charge by battery = total work done by charge on components
Adding a cell
Cell voltages add up
C = C1+ C2
Current
The same everywhere
All components get the same current
A1 = A2 = A3
Size is determined by total voltage of the cells and resistance of the circuit
Adding cells
Increases voltage but not resistance
Current increases
Resistance
Sum of resistances of all components
R = R1 R2
The lager the resistance, the larger the share of voltage the component receives
Parallel Circuit
Voltage
P.D is the same across all components
Each component = P.D of battery
V1 = V2 = V3
Identical bulbs in parallel will be same brightness
Adding cells
Total voltage stays the same
Each charge only goes through one cell
C = C1 =C2
Current
Adding cells
Increase total current
Current through each cell is less than the rest of the circuit as they join to make the total current
Total current is shared between braches
A = A1 + A2
Current into junction = current leaving
Resistance
Always less than that of the branch of the lowest resistance
Charge has more than 1 option, so only some flows across each branch
Circuit with 2 resistors in parallel < resistance than circuit with resistor alone
Parallel has higher current
Types of Current
AC
Alternating current
Our mains supply
Allows transformers to work
Easy to generate/ transport
Turn a magnet inside an iron core!
DC
Direct current
In batteries
Harder to generate/ transport than AC
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