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What is a closed circuit?
A closed circuit is a circuit whereby electric current can flow through.
What is an open circuit?
An open circuit is a circuit whereby electric current cannot flow through.
Give an example of a material that do not allow electric current to flow through them.
Electrical insulators Example: Plastic, rubber, glass
Give an example of a material that allow electric current to flow through them.
Electrical conductors Example: Metals
Suggest two ways to increase the brightness of the bulbs in the circuit shown.
Remove 1 bulb and increase more batteries
How should bulbs in a circuit be arranged such that when one bulb blows, the other bulbs can still light up?
Connect them in parallel.
Suggest two ways to use electricity safely.
Prevent overloading OR Hold onto plastic/wooden handles when using electrical appliances OR Never touch switches with wet hands OR Ask electrician for repair
Suggest two ways to conserve electricity.
Use a fan instead of an air-conditioner OR Switch off electrical appliances when not in use OR Use motion sensors OR Use energy saving appliances
What is air made up of?
Air is made up of nitrogen, oxygen, carbon dioxide, water vapour and other gases. Note: They are present in different amounts.
Air enters and leaves a fish through the _______.
Air enters and leaves a fish through the gills.
Air enters and leaves a plant through the _____ ________ on leaves.
Air enters and leaves a plant through the tiny openings on leaves.
The heart pumps ______ to all parts of the body.
The heart pumps blood to all parts of the body.
The blood transports the following 1) _________, _________ and _______ _______ to all parts of the body. 2) ______ ______ and __________ _________ away from various parts of the body for removal.
The blood transports the following 1) oxygen, water and digested food to all parts of the body. 2) carbon dioxide and waste materials away from various parts
Food-carrying tubes transport _____ made from the _____ to all parts of the plant.
Food-carrying tubes transport food made from the leaves to all parts of the plant.
Water-carrying tubes transport _____ and _____ from _____ to all parts of the plant.
Water-carrying tubes transport water and minerals from roots to all parts of the plant.
