What is an electronic device in which all air has been removed?
vacuum tube
100
Which of the following is not a form of energy?
electricity
magnetism
light
watt
watt
100
____________ is a good insulator.
rubber
100
What is another name for an integrated circuit?
chip
100
How many kilowatt-hours does a 100 watt light use in 20 hours?
2
200
What is a tiny piece of silicon or germanium that contains thousands of electronic devices and circuits?
integrated circuit
200
An electromagnet's poles change if...
electric current is turned on
electric current is turned off
mechanical energy id produced
electric current changes direction
electric current changes direction
200
One of the draw backs of using a vacuum tube in electronic devices is that they are ____________.
too large
200
What is the field of science that studies the movement in objects such as radios and tvs?
electronics
200
Give me an example of an electric device.
TV
300
What unit measures the amount of electrical energy used?
kilowatt-hour
300
What is the best conductor?
copper
glass
wood
plastic
copper
300
Transistors replace _________________ in the 1960's.
vacuum tubes
300
What is the pushing power of an electric source?
voltage
300
Why were transistors replaced by chips?
Chips are smaller.
400
What is electricity?
A flow of electrons.
400
What changes kinetic energy into mechanical energy?
a windmill
a sled
a generator
a toaster
a windmill
400
In an electric motor, electrical energy is changed into ________________.
mechanical energy
400
What becomes magnetic when electric current flows through it?
electromagnet
400
What do vacuum tubes do in an electric device?
control electric current
500
What does voltage measure?
power of an electric source
500
What type of energy does a generator use to produce electricity?
potential
thermal
light
mechanical
mechanical
500
In a electromagnet, the metal core behaves like a _________.
magnet
500
What is a magnetic field?
The region around a magnet where the magnetic force can be felt.
500
Describe the disadvantage of using transistors.
Transistors need to be wired together in a circuit. The wiring often comes apart. Transistors are also larger than integrated circuits.