Classrep2

THe current in the circuit is I. The pd across R1 is V2 and the pd acrouse R2 is V2, explain how the law of conservation of energy applies in the circuit , you should consider the movement of one coulomb of charge around the circuit. (2) - ANSWER-(1 C of) the charge gains ε J on passing through cells. - (for 2 mark) ε= IR1+IR2+Ir Prisim question path of ray info? - ANSWERSommit like the ray reflecting back outside of prism is parallel to refracting ray of light paths (I think, maybe). G...

Diode - ANSWERAllows current to flow in only one direction specific heat capacity - ANSWERthe energy required to raise the temperature of one Kg of a substance by one degree Celsius Thermal insulation - ANSWERMaterial which is used to reduce the amount of energy transferred by heating from an object. electrical resistance - ANSWERThe opposition posed by a material or a device to the flow of current Density - ANSWERthe degree of compactness of a substance. lamp - ANSWERcircle with ...

an object or group of objects - ANSWERsystem _______ energy is the total kinetic energy and potential energy of all particles that make up a system - ANSWERinternal the idea that there is the same amount of energy befire and after it is transferred - ANSWERconservation of energy energy cannot be ------- -- --------- - ANSWERcreated or destroyed = 0.5 x mass x (speed)^2 - ANSWERkinetic energy type of energy stored in a stretched spring - ANSWERelastic potential energy = mass x g...

What is the potential voltage of uk mains electricity supply? - ANSWER230V What colour is the earth wire in a three-core cable - ANSWERYellow and green stripes What is the frequency of the UK mains electricity supply? - ANSWER50Hz What is the role of a step-up transformer? - ANSWERTo reduce the energy lost due to heating What is an isotope? - ANSWERAtom with same number protons but different number of neutrons Is radioactive decay random? - ANSWERYes What is a half-life? - ANSW...

Energy is transferred between stores - ANSWERThermal, kinetic, gravitational potential, elastic potential, chemical, magnetic, electrostatic, nuclear Energy is transferred... - ANSWERMechanically (by a force doing work), electrically (work done by moving charges), by heating or by radiation (like light or sound) When a system changes, energy is transferred - ANSWERIt can be transferred into or away from the system, between objects in the system or between different types of energy stores. ...

conservation of energy - ANSWERlaw that says energy cannot be created or destroyed, but can change forms uses of friction - ANSWER- rubbing hands for warmth - break pads on bikes Increase efficiency - ANSWER- add lubricant - reduce friction internal energy - ANSWERthe sum of the kinetic and potential energies of all particles in the system Conduction - ANSWERThe direct transfer of heat from one substance to another substance that it is touching. Convection - ANSWERThe transfer o...

Energy Stores - ANSWER1) Elastic potential 2) Gravitational potential 3) Thermal 4) Electrostatic 5) Nuclear 6) Chemical 7) Kinetic 8) Magnetic 9) Light 10) Sound How is energy transferred? - ANSWER1) Mechanically - force doing work 2) Electrically - work done by moving charges 3) Heating/Radiation - light, sound How can work be done? - ANSWERWhen a current flows or by a force moving an object Kinetic energy formula - ANSWERE=1/2mv² Kinetic energy(J) = 0.5 x mass(kg) x s...

What is meant by work function (2) - ANSWERMinimum energy required by an electron to escape from (1) a metal surface (1) What is meant by ionisation energy? (2) - ANSWERMinimum energy required to remove an electron from an atom (1) from the ground state (1) Why do emitted electrons have a kinetic energy that varies up to a maximum value? (4) - ANSWEREnergy of a photon is fixed/constant (1) Energy is required for electrons to overcome work function ø (1) Electrons deeper into/below the s...

step-up transformer (first transformer in a national grid diagram) - ANSWERa transformer that increases voltage step-down transformer (second transformer in a national grid diagram) - ANSWERa transformer that decreases voltage transformer - ANSWERA device that increases or decreases the voltage of alternating current transformer - ANSWERdecreases current Power=(current)^2*resistance - ANSWERP=I^2*R Resistance equation - ANSWERVoltage/current Efficiency equation - ANSWEREfficien...

Current - ANSWERRate of flow of charge Coulomb - ANSWERThe amount of charge passing a point when a current of 1A flows for 1s Potential difference - ANSWERThe work done per unit charge in moving a small point positive charge between two points Threshold Voltage for a Diode - ANSWERThe voltage at which a current will begin to flow at, assumed to be +0.6V if not stated Reverse Bias - ANSWERWhen very little currency can flow in the reverse direction of a diode Variable Resistor - ANS...