Worksheets10g 1st Final Review 1
Total questions: 13
Worksheet time: 7mins
Which of the following describes the energy changes in a cars engine?
chemical -> electrical -> mechanical
mechanical -> thermal -> mechanical
chemical -> thermal -> mechanical
thermal -> mechanical -> chemical
A killowatt-hour is a unit of _____________
power
electrical energy
current
resistance
Where is the magnetic force exerted by a magnet the strongest?
center
north pole
south pole
both poles
A generator turns ________ into ____________
thermal energy, electricity
electricity, thermal energy
mechanical energy, electricity
electricity, mechanical energy
To produce electric current, nuclear power plants produce which of the following?
steam
carbon dioxide
plutonium
water
Which of the following is the source of almost all of Earth's energy resources?
plants
magma
the Sun
fossil fuels
Which is a conductor?
glass
copper
wood
plastic
Which of the following will NOT increase the strength of an electromagnet?
more coils
an iron core
bigger wires
wind energy
Which of the following materials is a good thermal insulator?
copper
iron
plastic
aluminium
If you burn your hand on a hot pan, then how was that heat transferred to your skin?
conduction
convection
radiation
insulation
You do 90 J of work in 30 seconds. How much power have you generated?
30 W
3 W
120 W
270 W
What size resistor would produce a 3 amp current flow through a 12 volt battery?
1 ohm
3 ohms
4 ohms
12 ohms
A refrigerator uses 1200 W of electrical power. What is the durrent in the refridgerator if it is plugged into a 220V outlet?
220 amps
5.45 amps
264000 amps
1200 amps
