# Electric Circuits

- Created by: Epic Al
- Created on: 26-06-22 11:22

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- Electric Circuits
- Charges and fields
- Some insulating materials become charged when rubbed together
- Electrons are transferred when objects become charged
- Positive - lose electrons
- Negative - gain electrons

- like charges repel, unlike charges attract
- non contact force

- Potential difference and resistance
- V = E / Q
- Volts = energy transferred / charge

- R = V / I
- Resistance = potential difference / current

- Ohms law
- the current through a resistor at constant is directly proportional to the potential difference across the resistor

- Reversing the p.d across a resistor reverses the current through it

- V = E / Q
- Component characteristics (IV graphs)
- Filament lamps
- resistance increases - temperature increases

- Diode
- Forward resistance low - reverse resistance high

- Thermistor
- resistance decreases if temperature increases

- LDR
- Untitled

- Filament lamps
- Series Circuits
- components
- current is the same in each component
- total PD is shared between the components
- adding their resistance gives the total resistance

- for cells the total PD is the sum of their individual PD's
- for resistors in a circuit total resistance is them added together
- More resistors increases resistance

- components
- Parallel circuits
- components
- total current is sum of the currents through the separate components
- PD across each component is the same

- Bigger the resistance, the smaller the current
- Adding more resistors in parallel decreases total resistance

- components

- Charges and fields

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