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P1 Energy transfer
Edexcel P1 Energy transfers
| Question | Answer |
|---|---|
| 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. |
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ursulinephys
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