Watt is a unit used to measure...
a-time
b-power
c-pressure
d-distance
b-power
100
Scientist know that matter and energy are really the same thing.
True :)
100
The sun has ___________ kind of energy
radiant
100
What kind of energy does a ball sitting on a shelf have? Explain.
Potential Energy
200
A _________ is a device that uses a magnet to change mechanical energy into electricity.
generator
200
A kilowatt hour equals...
a- 1000 watts used in one hour
b- 100 kilowatts used in one hour
c-100 watts used in one hour
d-1000 kilowatts used in one hour
a- 1000 watts used in one hour
200
The energy in gasoline is electrical.
False, chemical
200
When the atom gains an electron the atom has a _________ charge.
negative
200
How can a parked cars potential energy change to kinetic energy?
By making the car move
300
What is a wet cell?
a battery that changes chemical energy to electric energy in a liquid
300
Work takes place only when...
a- energy moves an object
b- force is applied
c- effort is used
d- nothing is moved
energy moves an object
300
A battery produces electrical energy using a chemical reaction.
True
300
All potential energy can be changed into _________.
kinetic energy
300
Name three ways to use electricity safely.
Never stick anything except a plug into an electrical outlet
Never use electric appliances when your body is wet
Never plug to many cords into one outlet
etc.
400
When scientist want to measure the amount of force used to move an object, they use the?
Newton
400
When energy changes forms,
a- some energy is gained
b-some energy is lost
c- the amount of energy stays the same
d- some energy is used up
c- the amount of energy stays the same
400
Plants change radiant energy into mechanical energy.
False, radiant into chemical
400
_________ is the kind of energy released when atoms are split or joined.
nuclear
400
Explain the difference between potential and kinetic energy.
Potential energy is the stored energy an object has because of its position, where kinetic energy is the energy of motion.
500
What is a dry cell?
a battery that changes chemical energy to electric energy in a nonliquid material
500
When too much current goes through a circuit, one result might be the
a-colling of the wires
b-jumping of electrons through the air
c-opening of a circuit breaker
d-closing of a circuit breaker
c-opening of a circuit breaker
500
Work= Force/Distance
False, Work= Force x Distance
500
A flow of electron from one place to another is __________.
electricity
500
What are the three main parts of a circuit?
A battery to push the electrons, soemthing to use the charge, and wires to carry the current.