Physics Final Exam
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- A device that transforms mechanical energy to electrical energy is a....
- generator
- a device that uses two coils around an iron core to change the voltage across a circuit is called a....
- transformer
- loops of wire in a motor rotate because a ....
- ???
- how much power is used by 6.0-V flashlight battery that draws a 0.5 A of current?
- 3 W
- the source of all magnetism is....
- ???
- electromagnetic waves travel at speeds...
- equal to the speeds of light
- a generator is used to light a bulb. energy for lighting the bulb actually comes from a...
- mechanical input to the generator
- When one light bulb in a series circuit containing several light bulbs burns out...
- none of the other bulbs will light up
- a transformer transforms.....
- voltage
- If you put a small compass in a magnetic field, the compass will...
- ???
- electric power is defined as...
- Current x Voltage
- an iron rod becomes magnetic when...
- ????
- the reason a magnet can attract an unmagnetized nail is that....
- nails become temporarily magnetized in a magnetic field.
- moving electric charges will interact with....
- an electric field & a magnetic field
- if u break a bar magnet in half , each half...
- becomes a bar magnet with two poles
- the voltage across a transformer primary coil that has 100 turns is 10V. What is the voltage across the secondary coil, which has 20 turns?
- 2 V
- a magnet is moved in and out of a coil of wire connected to several lamps. if the number coils is doubled and it is_____to move the magnet
- harder
- A device consisting of a coil that is mechanically rotated in a stationary magnetic field is called...
- generator
- If the north pole of one magnet is brought near the south pole of another magnet, the poles will....
- Attract each other
- a rubbed balloonwill stick to a wooden wall, which demonstrates charge....
- polarization
- a woman experiences an electric shock. the electrons making the shock come from...
- the woman's body
- compared to the resistance of two resistors connected in a series, the same two connected in a parallel have....
- less resistance
- electric current can best be induced in a wire by...
- moving a magnet up and down near the wire
- Protons & elctrons _____each other
- Attract
- a magnet is moved in and out of a coil of wire connected to a high-resistance voltmeter. if the number of coils doubles, the induced voltage
- doubles
- The primary coil of a transformer has 100 turns on it and the secondary coil has 50 turns on it. This is a ______transformer
- Step Down
- a magnet is moved in and out of a coil of wire connected to a high-resistance voltmeter. If the number of coils doubles, the induced voltage.....
- doubles
- a step-up transformer....
- increases voltage
- a decive that transforms electric energy to mechanical energy is a...
- motor
- an electromagnetic wave is composed of...
- perpendicular electric and magnetic fields vibrating together
- in a good insulator, electrons are usually...
- tightly bound in place
- most commercial generators are driven by...
- steam
- Fuses circuit breakers are used to .....
- all of the above
- magnetic field strength is....
- strongest at the poles of a magnet
- a transformer works because...
- electricity is induced in a rotating coil