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Physics: Electricity and Energy: Equations
Fichas del conjunto (17)
- 1A 1 kilogram brick is carried up the Eiffel Tower to the 275m platform. How much gravitational potential energy does the brick gain?E=mgh
- 2A 1000 kilogram car has a kinetic energy of 12500J. Calculate the speed the car is moving at.E=1/2m(vxv)
- 3An electrical motor rated at 12V and 0.2A is used to lift a 500g mass up a height. If the motor is switched on for 5 seconds calculate how far the mass is lifted.E=mgh
- 4A 2kW electric kettle is used to heat water. After 5 minutes the heat energy in the water is measured to be 450kJ. Calculate the efficiency of the kettle.%Efficiency=(Eout)/(Ein)x100
- 5How much energy must be transfered to raise the tempreture of 2kg of water from 20 degrees C to 30 degrees C?E=cmDeltaT
- 6Calculate the final tempreture of 3kg of lead which has been heated by an electrical heater of power 0.1kW for 2 minutes. The initial tempreture of the lead is 20 degrees C. Assume that no heat energy is lost t the atmosphereE=Pt then (assuing it is 100% efficient) E=cmdeltaT
- 7Calculate how much heat energy is needed to turn 2kg block of ice at minus 5 degrees C into water at 50 degrees C. Assume there are no losses of heat energy to the atmosphere.E=cmdeltaT then E=mL then E=cmdeltaT
- 8The pressure of a gas enclosed in a cylinder by a piston changes from 80kPa to 200kPa. If there is no change in tempreture and the initial volume was 25 litres, calculate the new volumeP1V1=P2V2
- 9The pressure of a gas enclosed in a cylinder is 180kPa at a temperature of 27 degrees C. If it is heated to a tempreture of 77 degrees C, calculate the new pressure.P1/T1=P2/T2
- 10The volume of a weather balloon that travels to extreme heights is 1(mxmxm) at sea level where the temperature is 21 degrees C. Calculate the new volume of the balloon when it rises to a height of 10km where the temperature is minus 45 degrees CV1/T1=V2/T2
- 11An electric fan has a resistance of 100 Ohms and is plugges into a wall outlet. How much current runs through the fan?V=IR
- 12The gas container which allows the volume to change store helium of volume 1.5(mxmxm) at a pressure of 100kPa and a temperature of 27 degrees C. If the pressure is increased to 250kPa at a temperature of 127 degrees C, calculate the new volume of the container.P1V1/T1=P2V2/T2
- 13An electrical mains heater is switched off for a period of 2 hours. If the heating elements operate at a current of 8A, find the electrical energy produced by the heaterP=IV then E=Pt
- 14Calculate the resistance of the element in a 2kW mains operated electrical heater. (Note: the 'element' is the name given to the section of wire that heats up when the current flows through it).(VxV)=PR
- 15Calculate the number of units of electricity used by a 60W bulb that is kept switched on for 8 hours and 45 minutes. We need to find the number of kWhE=Pt
- 16The weightlifter lifts the barbell at a constant speed from the ground up to the height shown in a time of 4 secondsW=mg then E=Fd then E=Pt
- 17Calculate the total charge which flows through a cell in 2 minutes when the current in the circuit is 5AQ=It
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- National 5 (Electricity and Energy) Physics Fichas sobre Physics: Electricity and Energy: Equations, creado por Lewis White el 14/05/2013.
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- Lewis White
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