physics ocr electricity
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physics ocr electricity - Marcador
physics ocr electricity - Detalles
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Preguntas:
33 preguntas
| 🇬🇧 | 🇬🇧 |
| What is this symbol | Variable resistor |
| What is this symbol | Diode |
| What is this symbol | Light emitting diode |
| What is this symbol | Light dependant resistor |
| What is this symbol | Thermistor |
| What is the equation for current ? | Charge/time |
| What is the equation for drift velocity ? | Current/no of electrons x area x charge on electron |
| What is the equation for resistance ? | Voltage/current |
| Define lost volts | The difference between emf and terminal pd when there is a charge flowing |
| Define terminal PD | The potential difference recorded across the terminals of a cell |
| Define current | The rate at which charge flows through a component |
| Define power | The rate at which energy is transferred from one form to another |
| Define emf | Transfer of energy by charge carriers from other forms to electrical energy |
| Define potential difference | The transfer of energy by charge carriers from electrical to other forms |
| Define drift velocity | The average velocity gained by the free electrons of a conducter |
| Define resistance | The opposition to the passage of current within a component |
| What happens when you add resistors in parallell? | The total resistance decreaces |
| Explain the potential difference in parallel circuits | Voltage in each branch is the same |
| Explain the potential difference in series circuits | Pd splits in ratios according to resistance |
| Explain the current in parallel circuits | Current splits into each branch and add to make the total current |
| Explain the current in series circuits | Current is the same |
| How does temperature affect its resistance | As tempt increases it causes ions to gain kinetic energy and move faster making it more difficult to pass without collisions resulting in more resistance |
| How does the length of a wire affect its resistance? | As the length of the wire increases so does the electrical resistance as electrons experience a smaller pd gradient as wire gets longer. the size of voltage per metre value decreases causing a lower drift velocity and more ions for electrons to collide with |
| How does the material of a wire affect its resistance? | Metals have delocalised electrons making them good conductors so resistance is lower . plastics and insulators do not so they have a higher resistance |
| How does cross sectional area of a wire affect its resistance? | A thicker wire means lower resistance as there is a bigger volume of space for the electrons to flow in |
| What factors affect resistance ? | Cross sectional area , material, length and temperature |
| What is ohms law? | Current flowing within a conductor is directly proportional to the pd across it provided that physical conditions such as temperature remain constant |
| What happens when pd is applied across a conducter? | The electrons accelerate and gain kinetic energy |
| What is kirchoffs second law? | Within any closed loop the sum of the emfs is equal to the sum of the products of current and resistance |
| What is kirchoffs first law? | Charge flowing into a circuit junction must equal the sum of charge leaving the junction |