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45 Cards in this Set
- Front
- Back
What is the formula for energy transfer?
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Energy Transferred = Mass x SpecificHeatCapacityx temperature change |
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What is the formula for efficiency?
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Efficiency = useful energy out / total energy in |
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what is the resistance equation |
(vanity is ridiculous) |
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What is the formula for electrical power?
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(peasants in Virginia) |
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What is the formula for wave speed? |
wave length = velocity / frequency
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What is the formula for force?
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Force = Mass x Acceleration
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What is the formula for momentum?
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Momentum = Mass x Velocity |
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What is the formula for force acting? |
Force Acting = Change in Momentum / Time |
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What is the formula for work done? |
Work Done = Force x Distance |
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What is the formula for power? |
Power = Work Done / Time |
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What is the formula for charge?
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Total Charge = Current x Time |
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What is the formula for a moment? |
Moment = Force x Perpendicular Distance
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What is the formula for energy transferred |
Energy Transferred = Work Done |
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What is the formula for density?
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Density = Mass / Volume
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What is acceleration?
What is the formula for acceleration? |
Acceleration = Change in Velocity / Time Taken |
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What is the formula for gravitational potential energy?
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Gravitational Potential = Mass x Gravity x Height Energy |
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What is the formula for weight?
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Weight = Mass x Gravity |
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What is the formula for pressure? |
Pressure = Force / Area |
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What is the formula for transformers? |
Np/Ns = Vp/Vs |
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What is the rule about power in transformers?
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Power in = Power out |
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What is the formula for pressure difference?
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Pressure Difference = Height x Density x Gravity |
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What is the formula for refractive index?
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Refractive Index = Sin(angle of incidence) / Sin(angle of refraction) |
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What is momentum?
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Momentum is the tendency for an object to keep moving in the same direction. |
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What is velocity?
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Velocity is the speed of an object moving in a particular direction. |
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What is acceleration?
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What are the three magnetic elements?
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Nickel Iron |
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What are electromagnets?
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Wires carrying a current have a magnetic field around them. Electromagnets are solenoids where current baring wire are wrapped around a metal, to produce a strong magnetic field which can be switched on and off. |
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What is Flemming's Left Hand Rule?
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THumb = THrust First Finger = Field SeCon Finger = Current |
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What affects the strength of an electromagnet? |
Size of Current Number of Turns of wire Having an Iron Core |
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What is the Motor affect?
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A current carrying wire in a magnetic field will experience a force. |
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What is electromagnetic induction?
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When a wire in a complete circuit is moved in a magnetic field a current is induced in said wire. |
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What affects the size of the current induced in electromagnetic induction? |
Magnetic field strength Number of turns of wire |
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What are transformers used for?
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They reduce energy loses by thermal heat loss in cables, when distributing electricity in the national grid, by making the current very low. |
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What is terminal velocity?
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Terminal Velocity is the point in which an object can accelerate no further. Eg. When the forces of drag and weight, on a free faller are equal, said free faller cannot fall any faster; so therefore has reached his terminal velocity or fastest possible speed. |
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What is Newton's First Law?
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What is Newton's third law? |
If object A exerts a force on object B then the object B will exert an equal but opposite force on object A. |
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What happens in an earth wire?
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Fault occurs Current flows through earth wire with low resistance High current flows through earth and live wires Fuse melts so circuit breaks |
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What is D.C?
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Direct Current doesn't alternate and comes from things like batteries and solar panels. |
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What is A.C? |
Alternation Current changes direction a lot and comes from the mains. |
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What is static electricity?
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Static Electricity is caused by friction between two insulators. Electrons move from one insulator to the other, causing conflicting attractions, so the insulators now attract. |
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What are alpha particles?
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They have 2 protons and two neutrons They have a positive charge They are slow moving and ionising They are easily stopped by skin or paper |
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What are beta particles?
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They move quite quickly They are moderately ionising They are negatively charged They are stopped by thin aluminium |
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What are gamma waves?
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Gamma Waves have no mass They are weakly ionising They're very harmful They have no charge Stopped only by thick lead |
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What are two examples of background radiation?
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Radon Gas Cosmic Rays |
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What is nuclear fission?
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The parent nucleus splits into two daughter nuclei and some neutrons These neutrons then go on to hit more parent nuclei |