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Electricity
Equations
| Term | Definition |
|---|---|
| Symbol for Power (and unit) | P (Watts) |
| Symbol for Resistance (and unit) | R (Ohms) |
| Symbol for Current (and unit) | I (Amps) |
| Symbol for Time (and unit) | t (Seconds) |
| Symbol for Charge (and unit) | Q (Coloumbs) |
| Equations Ohms Law | V = I R |
| Equations Two equations for Power | P = I V P = I x I x R |
| Equations Two equations for transfer of energy | E = P t E = Q V |
| Series Describe series Circuit | Single loop where electrons can flow |
| Parallel Describe parallel Circuit | Multiple loops where electrons can flow |
| Parallel Does the current split down multiples routes of a parallel circuit? | Yes |
| Series Is the current the same at all points of a series circuit? | Yes |
| Parallel Does the voltage split down multiples routes of a parallel circuit? | No |
| Series What is the total resistance for R1 and R2 in a series circuit? | R = R1 + R2 |
| Parallel What is the total resistance for R1 and R2 in a Parallel circuit? | 1/R = 1/R1 + 1/R2 |
| Parallel Is the resistance of resistors in parallel more, less or the same as the lowest resistance | Less |
| Series Is the resistance of resistors in series more, less or the same as the lowest resistance | More |
| Plugs What are the three wires called | Live, Neutral and Earth |
| Plugs What is the colour and purpose of the Live wire | Live wire is BROWN and carries the alternating potential difference |
| Plugs What is the colour and purpose of the Neutral wire | Neutral wire is BLUE and completes the circuit |
| Plugs What is the colour and purpose of the Earth wire | Earth wire is YELLOW & GREEN (like our lawn) and it is safety wire to stop an appliance becoming live |
| Plugs Which wire is connected to the fuse and why is this needed | Live wire is connected to the fuse and is required to break the circuit if there is a surge of power |
| What does AC stand for? | Alternating Current |
| What does DC stand for? | Direct Current |
| Give an example where AC and DC are used. | AC => Mains electricity DC => Batteries |
| Equations Equation for charge flow, current and time | Q = I t |
| What is electric current? | An electric current is the flow of charge, usually electrons |
| What is an Ohmic Conductor? | A material where the current is proportional to the potential difference at both ends |
| Describe the potential difference graphs for ohmic conductor, lamp and diode | Ohmic conductor - straight diagonal line passing through the origin Lamp - S shaped curve Diode - Flat one side of y axis then diagonal increase |
| Why does the lamp provide an s shaped curve? | As the current increases so does the temperature, thus increasing the number of collisions, slowing the electrons |
| What is the voltage of mains electricity? | 240v |
| What is the frequency of mains electricity? | 50Hz |
Created by:
ThomasMuz
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