12725219
Description
Flashcards by Evangeline Jose, updated more than 1 year ago
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Created by Evangeline Jose
about 6 years ago
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| Question | Answer |
| What is the equation that links: kinetic energy, mass, velocity? | kinetic energy (j) = 1/2 mass * velocity^2 |
| What are the two equations for power? | power (watt) = energy transferred (j) /time (s) power (watt) = work done (j) / time (s) |
| What is meant by the term 'efficiency' ? | The less energy that is 'wasted' the more efficient a product is. |
| What is the equation for 'efficiency' ? | efficiency = useful output energy/total input energy transfer. |
| What is the 'National grid' and what are the 5 stages to the process? | The 'National grid' is a giant system of cables and transformers that covers the UK and connect power stations to consumers. Power stations, step up transformer, pylons, step down transformer, consumers. |
| What is current? | flow of electrical charge |
| What is the unit for 'potential difference'? | volts, v |
| What is the unit for resistance? | ohms |
| What is the equation that links current, charge flow, and time? | charge flow (c) = current (a)*time (s) |
| What is the equation for resistance? | potential difference (v) = current (a) * resistance (ohms) |
| What is DC? | direct current - same direction. |
| What is AC? | alternating current - constantly changing direction. |
| Mains electricity What colour is the 'live wire'? | brown. |
| Mains electricity Which wire is the colour 'blue' ? | neutral wire |
| Mains electricity What is colour is the earth wire? | yellow and green |
| Mains electricity what is the use of the 'live wire' ? | carries the alternating potential difference form the supply. |
| Mains electricity What is the use of the 'neutral wire' ? | completes the circuit. |
| Mains electricity What is the use of the 'earth wire' ? | safety wire to stop the appliance becoming live. |
| What is the equation for density? | density (kg/m^3) = mass (kg) / volume (m^3) |
| What is 'specific heat capacity' ? | SHC of a substance is the amount of energy needed to raise the temperature of 1kg of the substance to 1^. |
| What is the equation for SHC? | change in thermal energy = mass * SHC * temperature change |
| What is specific latent heat of fusion? | energy needed to change the state from solid to liquid. |
| What is specific latent heat of vaporisation? | energy needed to change the state from liquid to vapour. |
| What is the equation for SLH of vaporisation? | energy (j) = mass (kg) * SLH (j/kg) |
| What increases the electrons distance from the nucleus? | absorbs electromagnetic radiation. |
| What decreases the electrons distance from the nucleus? | emits electromagnetic radiation. |
| What is a alpha particle? | Is a helium nuclei. 2 protons and 2 neutrons. |
| What is a beta particle? | Is a high speed electron. virtually no mass (-1). |
| What is gamma ray? | Is a electromagnetic waves emitted from the nucleus. |
| What is alpha decay? | decreases the charge and mass of the nucleus. |
| What is bata decay? | increases the charge of the nucleus. |
| What is gamma decay? | doesn't change anything. |
| What is half-life? | the half-life is the time taken for the number of radioactive nuclei in an isotope to halve. |
| What is contamination? | radioactive particles that get into the other objects. |
| What is irradiation? | the process of exposing objects to nuclear radiation. |
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