q('~What is the name of a material that allows an electric current to flow easily through it? ~conductor~Water and all metals are examples of this kind of material.~As well as water and metal, another good conductor is the air around us.~');
q('~What is the word for the rubbing together of two objects to create static electricity? ~friction~We use oil to reduce this in the moving parts of a car or bike.~The friction caused by rubbing a balloon lets you fix it to the wall.~');
q('~What is the unit of force used to measure electricity? ~volt~In Germany the electricity is measured at 220 of these.~A flash of lightning measures as much as 100 million volts.~');
q('~A strong kind of magnet can be made by sending an electric current through a coil with a metal core. What is the name for this magnet? ~electromagnet~These are powerful enough to pick up a car.~An electromagnet can be turned on and off.~');
q('~One way to describe electricity is as the movement of negative particles through a conductor. What is the name for these particles? ~electrons~The corresponding positive particles are called protons.~The flow of electrons is slowed when passing through an insulator.~');
q('~This is the name for the small electric cell that is needed to operate electrical equipment such as walkmans and flashlights. ~battery~Without this in a simple circuit, the bulb would not light up.~Small batteries produce between 1 and 5 volts.~');
q('~What is the opposite of attract? ~repel~Unlike poles of two magnets attract each other. What do like poles do?~The north pole of one magnet will attract the south pole of another.~');
q('~What is the name for the bolt of static electricity that flashes down from the sky in a thunderstorm? ~lightning~It can carry a charge of 100 million volts or more.~Never stand under a lone tree during a thunderstorm!~');
q('~What is another name for an incomplete or open circuit? ~short circuit~In this kind of circuit, the electricity cannot flow all the way around, and so the bulb will not light up.~Short circuits can sometimes cause fires. ~');
q('~What do we call a material that does not allow electricity to pass through it? ~insulator~Rubber and plastic are examples of this.~Plastic and rubber are insulators that are put around electric wires to protect us from the current.~');
q('~What is the name for the force stopping the flow of electricity through an object? ~resistance~When there is little of this in a circuit, the bulb will glow more brightly.~The loudness of a hi-fi system is controlled by using resistance to slow the current.~');
q('~What word is used to describe the state of most objects (which have an equal number of positive and negative charges)? ~neutral~Most objects are in this state until they are rubbed.~Neutral objects do not attract or repel each other.~');
q('~What is the word used to describe the flow of electrons through a wire? ~current~This is also the word used to describe the speed of the flow of water in a river.~The greater the current, the more dangerous it is if you touch the wire.~');
q('~What word is used for the end of a magnet? ~pole~It is also the word for the cold places at the top and bottom of the world.~The opposite or unlike poles of a magnet attract each other.~');
q('~It has a thin wire inside it. The wire heats up and glows when an electric current is passed through it. What is it? ~bulb~It has the shape of a pear.~The bulb will only glow if it is part of a closed circuit.~');
q('~What do the two south poles of a magnet do when they are brought close together? ~repel~It is the opposite of attract.~Like poles repel; unlike poles attract.~');
q('~What is the term for a circuit with no gaps? ~closed circuit~It is the opposite of a short circuit.~The current can flow all around a closed circuit and so the bulb will light up.~');