Science: Chapter 14
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- Attract
- Opposite poles do what?
- Interacting magnetic fields
- What causes magnetic force
- They both use loops & external magnets, and convert energy
- How is a generator like an electric motor?
- Geographic South Pole
- Mangetic North Pole in Antartica
- alternating current
- an electric current that reverses its direction at regularly recurring intervals
- Large Bar Magnet
- What does a solanoid resemble?
- magnetic field
- a region where a magnetic force can be detected
- electromagnet
- a conducting wire, wrapped aroubd a soft iron core, connected to a battery
- Faraday's Law
- An electric current can be produced in a circut by a changing magnetic field
- A current is induced in the wire
- When a loop moves in or out of the magnetic field...
- Repel
- Like poles do what?
- It's domains are randomly oriented
- When a potentially magnetic substance is unmagnetized...
- The number of loops in a solenoid
- What is proportional to the voltage of a solenoid?
- A magnetic field's poles
- Where a magnetic field is strongest
- Ampere's Law
- Moving electric currents produce magnetic fields
- Earth
- A gigantic bar magnet
- the direction of the current in the coil of the wire changes, and the paper cone attatched to the coil moves
- In a speaker, sound waves are produced when...
- Geographic North Pole
- Magnetic South Pole in Canada
- The current in the coil produces a magnetic field that interacts with the magnetic field of the surrounding magnet
- In an electric motor, the coil turns when...
- transformer
- a device that can change one alternating current voltage to a different alternating-current voltage
- The 1st Operating Principle
- What is Ampere's Law?
- Magnetic North Pole
- Geographic South Pole in Antartica
- magnetic force
- What do stereo speakers use to produce sound?
- the direction of the domains becomes more unifrom, and the material becomes magnetized
- When in an external magnetic field...
- Increase or decrease voltage
- What can a transformer do when hooked up to two galvanometers?
- electric motor
- a device that converts electrical energy to mechanical energy
- electromagnetic induction
- the production of a current in a conducting circut by a change in the strength, position or orientation of an external magnetic field
- magnetic pole
- an area of a magnet where the magnetic force appears to be strongest
- A generator converts mechanical energy to electircal energy, while an electric motor does the exact opposite.
- How is a generator NOT like an electric motor?
- galvanometer
- an instrument that measures the amount of current in a circut.
- A single electromagnetic force which oscilate at right angles to the both.
- What are electricity and magnetism a part of?
- compass
- a device used to trace a magnetic field
- Right Hand Rule
- If you imagine holding the wire in your right hand with your thumb pointing in the direction of the positive current, the direction your fingers would curl is the direction of the magnetic field
- solenoid
- a long wound coil of insulated wire
- generator
- a device that uses electromagnetic induction to convert mechanical energy to electrical energy
- The 2nd Operating Principle
- What is Faraday's Law?
- Operating principle
- the principle by which something operates
- Magnetic South Pole
- Geographic North Pole in Canada
- step-down transformer
- a device in which the transformer's secondary coil has fewer loops than the primary coil, causing the voltage to be lowered.
- magnet
- What has two poles that cannot be isolated?
- Every half turn of the loop
- For AC, how often does the direction of the current change?
- magnetic repulsion between the coil and the magnet causes the coil to twist
- When there is current in the coil of the galvanometer,
- step-up transformer
- a device in which the transformer's secondary coil is greater in voltage than the voltage across the primary coil
- moving charges
- What is magnetism caused by?
- domains
- a microscopic magnetic region composed of a group of atoms whose magnetic fields are aligned in a common direction