Zusammenfassung der Ressource
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