Teacher Resources
OXFORD PRACTICAL TEACHING: CHEMISTRY LABORATORY GUIDE
OUP SA
RESOURCES
OXFORD PRACTICAL TEACHING: LIFE SCIENCES LABORATORY GUIDE
OUP SA
Laboratory Guide 978 0 19 599128 4 Laboratory Guide 978 0 19 599126 0
OXFORD PRACTICAL TEACHING: PHYSICS LABORATORY GUIDE
OUP SA
Laboratory Guide 978 0 19 599127 7 UNIT 4 Safety in the physics laboratory
Safety must be a top priority, whether Physical Sciences is taught in a laboratory or in a classroom. The principal of your school must appoint a staff member annually as the school’s safety officer. You should consult with the safety officer on how you run the laboratory.
General arrangements
Laboratory exits must be marked clearly and learners must know exactly how to vacate the laboratory quickly and in an orderly way. Always keep passages clear of obstructions. Ask learners to store their bags under the tables or at the back of the laboratory during practical lessons. Place fire-fighting equipment strategically. This includes a portable carbon dioxide extinguisher, a sand bucket and a blanket.
ally. This inguisher, a
Inspect practical equipment, safety equipment, storage areas and spaces used for practical investigations quarterly. Report any correctional measures that need to be taken to the safety officer. Insist at all times that learners behave themselves appropriately in the laboratory or classroom. Continuously point out that the co-operation of every person is needed for constructive and enjoyable learning.
uipment, ical
orrectional safety officer. themselves ssroom.
peration of ve and enjoyable learning.
On the CD: A chart with the basics of appropriate behaviour in the Physicshysics class
laboratory. Put it up against the wall and work through it with each class new sc
of appropriate behaviour in the Ph ll and work through it with each c
section at the beginning of every new school year. Electrical safety
Ensure that you know where the electrical switchboard for your laboratory or classroom is, and that you can identify the trip-switches. You must know where the earth leakage unit for your laboratory or classroom is. Discuss the quarterly checking of the unit with your safety officer.
TRIP-SWITCH
More correctly called a circuit breaker. An electrical switch that automatically interrupts the electric circuit if a large amount of current is detected. Modern alternative to a fuse – after switching off, a circuit breaker can easily be “flicked” back on, which is much easier than replacing a broken fuse.
er. An electrical switch that automatically ge amount of current is detected. Modern
ng off, a circuit breaker can easily be asier than replacing a broken fuse.
12 CHAPTER 1 | The basics of practical physics h 9/29/10 11:52:06 AM
ctrical switchboard for your laboratory or fy the trip-switches. kage unit for your laboratory or classroom fthe unit with your safety officer.
Danger Do not use a water
hose to extinguish fires in a hysics laboratory. It will most likely lead to electric shock.
hose to extinguish fires P ysics laboratory
y and learners must know exactly how an orderly way. Always keep passages ore their bags under the tables or at the lessons.
Note
The Chemistry laboratory guide in this series contains detailed information on safety and first aid for a Chemistry laboratory.
124 Oxford University Press South Africa
OxfordSASchools
Fig. 1 Example of trip-switches
Always check that the work area and floor space around electrical equipment is dry.
Tell learners to always switch the current off before adjusting a circuit. After practical sessions, check that learners have switched off and unplugged all electrical equipment.
Fig. 2 Example of an earth leakage unit
EARTH LEAKAGE UNIT Safety device used in electrical installations. If it detects current leaking from a conducting circuit, it then opens a circuit breaker. This cuts off electrical power.
Never let learners connect a single wire to both terminals of a power supply; it will result in a circuit with a very low resistance. The wire will become dangerously hot and the power supply could be damaged.
Treating electrical shock
Step 1 Do not touch the person, appliance or the switch of the appliance. Stand on non-conducting material, for example a plastic crate or a thick rubber surface.
Step 2 Switch off the electricity at the mains trip switch or earth leakage unit. Alternatively, use a wooden meter rule to switch off the wall switch.
Step 3 Use a wooden stick, broomstick or thick rubber gloves to separate the person from the source of electricity.
Step 4 If the electric shock caused the person to jump away from the source, check for other injuries on the body.
Step 5 Cover any burns on the body with dressings. If the patient shows symptoms such as rapid breathing, nausea, weakness or anxiety, treat him for shock. Let the patient lie down with legs raised slightly and use a blanket to keep him warm.
Step 6 Seek professional medical help.
UNIT 4 | Safety in the Physics laboratory Chapter 1 OPTP
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