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Static electricity

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by

Liam Fishwick

on 28 May 2015

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Transcript of Static electricity

Objectives
Describe the attraction and repulsion of charged objects (E)

Be able to describe some common uses of electrostatics (C)

Demonstrate an understanding of the dangers of electrostatics (A)
What is static electricity?
1. A Cloth is rubbed with a polythene rod. Explain how both the rod and cloth become charged.

2. The cloth is positively charged. Which particles have moved?

3. What charge is on the rod? What does this mean
Uses of electrostatics
You need to be able to describe how the following applications of static electricity work:

Electrostatic spray paint.
Photocopier.
Electrostatic precipitators.
Dangers of electrostatics
Electrostatics can be useful.

They can also be dangerous.
Static electricity
Questions
Complete worksheet P2.2a. Match the items and stick them in your books.
Starter: Label the structure of the atom
1. Friction causes electrons to move from one object to the other. Electrons are removed from atoms.

2. Electrons have moved from the cloth to the rod.

3. The rod has a negative charge, which means an excess of electrons
A student charges two balloons and hangs them side by side.
Explain why the cotton threads are not vertical.
(2)
Answer:
An explanation linking: Balloons repel (1)
(because) they have like charges (1)
Accept
Balloons repulse / push away (from each other / to the side) (1)
same charge / both positive / both negative (1)

accept like charges repel for 2 marks
Questions
1. Complete the uses worksheet.
Plenary
Complete the exam questions
Q1. (i)
Correct responses can be seen in (i) or (ii)
An explanation linking
electrons (1)
and one of removed by friction (1)
(transferred) to plastic (1)
(2)

(ii)
opposite to charge on plastic (1)
equal to charge on the plastic (1)
(2)

Q2.
A (1)

Q3.
A description to include:
the situation which created the charge separation (1)
where the spark travelled (from or to) (1)
["positive electrons/ protons moving", seen anywhere in part (i) or (ii) loses this mark]
ignore reference to charge before rubbing
transferred from cloth


charge on cloth is positive
same size as charge on plastic
electrons transferred from the cloth equal to electrons lost by cloth







examples
when refuelling, spark between end of {fuel/pipe} and vehicle =2 spark {between/from /to} person comb/clothes/metal handle and, when combing hair/removing clothing/opening door = 2 lightning flash, between cloud and cloud/plane/ground, =2 ignore between plug and socket/jump leads
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