Physics 0.0 / 5 ? EconomicsEggsScottish Advanced HighersEdexcel Created by: autopianjewCreated on: 26-06-17 14:32 Define the term: Effeciency Energy efficiency is a measure of how well a device transfers energy into the form we want. 1 of 43 What is the calculation for effeciency? efficiency = ( useful energy transferred ÷ energy supplied ) × 100 2 of 43 Can effeciency ever be 100 of a product, and why? No as some of it is always lost to watched energy (heat, sound). 3 of 43 How can efficiency in mechanical systems be increased? Making it more aero-dynamic; less heat loss; more lubricated, reduce friction 4 of 43 What is a U Value? How much thermal energy transfers each second 5 of 43 What does a High U-Value show? More energy transfer every second meaning it loses heat quicker. 6 of 43 What do resistors in Series circuits do to form a greater resistance? Add together 7 of 43 What do resistors in a Paralel circuit do to reduce total resistance? Combine together 8 of 43 What is the Specific heat capacity of a material mean? The amount of energy required to raise 1KG of the material by 1C. 9 of 43 Equation for Energy and their units? Energy (J) = Mass (KG) * SHC (J/KHc) * Change in temp (C) 10 of 43 What do large U-Values allow? They allow heat energy to flow more quickly. 11 of 43 What effect would reducing the U-Value of a insulator have? Makes it more efficient at maintaining a temperature and cheaper to insulate/run 12 of 43 What is the equation for Resistance? V = I*$ 13 of 43 In resistance, what does V stand for? And it's unit? Potential Difference (V) 14 of 43 In resistance, what does I stand for? And it's unit? Current (A) 15 of 43 In resistance, what does R stand for? And it's unit? Resistance (Ohms) 16 of 43 The current in a series circuit is what through each component? The same 17 of 43 The current in a parallel circuit is the sum of the current in ? In the seperate branches 18 of 43 How is the P.D in a series circuit spread? It's shared 19 of 43 What is the P.D in a paralel circuit like in each branch of the circuit? The same 20 of 43 Unit for Charge? In Coulombs, C 21 of 43 Charge (Q) = ? Charge (Q) = Current (I) (in Amps) * Time (t) (in Seconds) 22 of 43 In parallel circuits the current is ____ through every component The same 23 of 43 In series circuits the voltage across each components does what to the battery voltage? Adds up to the battery voltage 24 of 43 What does the voltage of each component in a series circuit depend on? Depends on it's resistance 25 of 43 What will never change in a series circuit? Amps 26 of 43 If a objects velocity changes, what also will change? It's momentum. 27 of 43 Is acceleration a Vector or scalar? Vector 28 of 43 What is Scalar? Only magnitude 29 of 43 What is Vector? Both direction and magnitude (size) 30 of 43 What does displacement mean? Distance from orginal start point 31 of 43 No resultant force = ? No change in momentum 32 of 43 What does the acceleration of a object depend on? (2 things) The resultant force applies and the mass of the object 33 of 43 What is Enertia? Something which has a resistance to motion 34 of 43 Momentum is ____ Converved 35 of 43 An increase in stopping distance is also a increase of? Impact time + Time of collision 36 of 43 What is Impact force equal to? The rate of change of momentum 37 of 43 Increasing the time of an impact will do what? Reduce the impact forces (meaning it lasts longer) 38 of 43 What happens when temperature increases on a resistor of a conductor? Resistance increases of the conductor 39 of 43 In low temperature's, the resistance of a thermistor is high meaning? Little current can flow through 40 of 43 At high temperatures, the resistance of a thermistor is low, how does this effect current? More current can flow through 41 of 43 In the dark; what is the resistance of a LDR like? And what does this mean? High so little current can flow through 42 of 43 In the bright light, what is the resistance of a LDR like? And what does this mean? The resistance of LDR is low, and more current can flow through it. 43 of 43
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