Download Charge, potential difference, energy and current

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