april science test

• Current is the amount of charge flowing per second, the faster it moves, the higher the current.
• The flow of electricity through a circuit is called an electric current.
• A current is measured with an ammeter, which is a device that measures the flow of current. The unit is amps.
• Resistance means to oppose. It is the ability to resist or to withstand. It is measured in ohms.
• In a series circuit, all the components are connected one after the other in a single loop.
• In a parallel circuit, there is more than one loop or branch.
• A magnet has two magnetic poles- a north and a south pole.
• Magnetic fields can be seen by using iron filings around magnets.
• The same poles will repel from each other
• Opposing poles will attract to each other
• In an electric field, there is a force on a charge.
• In a magnetic field there is a force on the magnet or a magnetic material.
• You can use a plotting compass to find out the shape of a magnet.
• A magnetic field is created by a magnet around itself.
• Electric current creates a magnetic field around it.
• Magnetic fields are invisible but they have effects that we can see.
• A pernament magnet is made from its own magnetic nature (natural resources) and has its own magnetic field.
• An electromagnet is iron core with a wire around it that is attracted to a magnetic field.