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P1 Energy transfer

Edexcel P1 Energy transfers

QuestionAnswer
Name 4 stores of energy gravitational, Chemical, Elastic and nuclear
Name 5 other forms of energy (than stores) Heat, Light, Sound, Electrical, Kinetic
What is kinetic energy? Energy for moving energy
What can you do to increase Gravitational Potential Energy of an object? Place the object higher up
What is the input energy in a torch? Chemical energy
What is the output (useful) energy in a torch? Light energy
What is the output (wasted) energy in a torch? Heat energy
If the input energy is 100J and the useful energy is 80J in a torch, how much has been wasted? 100-80=20J
If the input energy is 1000J and the wasted energy is 600J in a car engine, how much has been useful? 1000-600=400J
If a radio gives out 70J of sound and wastes 10J in heat, how much energy was there at the start? 70+10=80J
What is the relationship between input, output and wasted energy? the input energy is equal to the combined useful and wasted energy; input = useful+wasted
If the input energy is 100J and the useful energy is 80J in a torch, what is the efficiency? 80J/100J *100=80
What are efficiency ratings? Letters that allow you to compare the efficiency of electrical objects
Which is the better efficiency rating A or E? A
Apart from the power rating, what would you need to know to compare two types of light bulbs? How long you use the light bulb for
Which colour loses heat fastest: black or white? Black
A swimming pool radiates 1200W of energy. How much energy must you heat it up with to keep the temperature the same? 1200W
What happens if an object receives more heat than it radiates? The object heats up
What happens if an object radiates more heat than it receives? The object cools down
What does "an object radiates heat" mean? When an object loses heat energy
The students use the electric motor to lift a weight. The current in the motor is 0.5 A. The potential difference (voltage) across the motor is 6 V. Calculate the input power to the motor. State the unit.
Calculate the efficiency of the motor, when 50J is energy transferred to the weight being lifted and you started with 200J input.
How much energy is wasted, when 50J is energy transferred to the weight being lifted and you started with 200J input.
Give a scientific reason why the case of the motor is painted black.
Created by: ursulinephys
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