Charge, potential difference, energy and current

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Presentation transcript:

Charge, potential difference, energy and current

What does it mean if something is described as charged? .......................................................................................................................................................................................................................................(1 mark) List 3 ways that static electricity is used in industry? …………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………(3 marks) For one of the above examples, describe how the process works. ……………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………….(4 marks) What is the equation that links charge, current and time? ..............................................................................................................(1mark) What is the equation that links charge, potential difference and energy? .............................................................................................................(1 mark) How much charge flows when a current of 2A flows for 30 seconds? ..............................................................................................................(1mark) What current flows if a charge of 300C flows for 3minutes? ……………………………………...........................................................(1 mark) What current flows if a charge of 270C flows for 106seconds? ……………………………………………………………………………….(1 mark) A p.d. of 12V is applied across a resistor. 250C of charge passes. How much energy was dissipated by the resistor ? …..........................................................................................................(1 mark) A current of 0.12A flows through a resistor of 150 Ohms, 300C of charge passes. How much energy was dissipated by the resistor? …........................................................................................................(2 marks) A light bulb releases 230J of energy when connected to a 11V battery. How much charge flowed in the circuit? ………………………………………………………………………….……(1 mark)

The diagram shows a charged thundercloud. (a) Why does the tree below the thundercloud become positively charged? ......................................................................................................... ......................................................................................................... (1 mark) (b) The base of the cloud has a negative charge of 18 coulombs. The potential difference between the base of the cloud and the ground is 1 200 000 kilovolts. (i) Write down the equation that links charge, energy transferred and potential difference. ........................................................................................................ (1 mark)

(ii) Calculate the maximum energy that could be transferred to the ground by a lightning strike. Show clearly how you work out your answer. ......................................................................................................... ................................................................................................................................................................................................................. Maximum energy transferred =……………………………… joules (2 marks) (c) A lightning conductor is usually attached to tall buildings. This reduces the risk of damage by a lightning strike. Explain why the lightning conductor is made of copper. .................................................................................................................................................................................................................. ......................................................................................................... ......................................................................................................... ......................................................................................................... (2 marks)