Electricity
- Created by: 14eb
- Created on: 29-11-19 11:03
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- Electricity
- Potential Dividers
- Series
- By using two resistors, it is possible to divide a voltage and create a different voltage between them.
- V1/V2 = R1/R2
- Parallel
- Have to work out parallel resistance as R2 before using equation.
- V1/V2 = R1/R2
- Series
- Internal Resistance
- The amount of resistance present in the power supply of a circuit.
- Lost volts = Ir
- E=V+Ir
- E=I(r+R)
- E=V+Ir
- Resistivity
- R=(pL)/A
- A measure of the resisting power of a specified material to the flow of an electric current.
- Electron Gun
- An electrical component in some vacuum tubes that produces a narow electron beam that has a precise kinetic energy.
- Computer monitors, televisions and cathode ray oscilloscopes.
- Drift Velocity
- The average velocity attained by charged particles in a material due to an electric field.
- I=Anev
- Ohm's Law
- V=IR
- The current through a conductor between two points is directly proportional to the voltage across the two points.
- Power
- V=IR
- W=QV
- P=IV
- Q=It
- The amount of energy changing form per second.
- Electromotive Force
- E=V+Ir
- E=I(r+R)
- The voltage when there is no current travelling around the circuit.
- E=V+Ir
- V/I Characteristics
- Diode: No voltage until the threshold voltage, where it spikes up.
- Filament Lamp: A shallow S shape.
- Resistor: Directly proportional.
- Thermistor: Opposite S shape to filament lamp, increasing gradient.
- Potential Dividers
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