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3rd-4th Grade Science Unit D Chapter 3 Electricity At Work
Test Description: Electricity at Work
Instructions: Answer all questions to get your test result.
1) A batter is made up of two or more ________________.
A
electromagnetics.
B
generators.
C
electric cells.
D
voltage.
2) _________________ produce the electricity that you use in your home and school.
A
Generators
B
Electromagnetics
C
Voltage
D
Solar cells
3) ______________________ change the Sun's energy into electrical energy.
A
Electrical cells
B
Voltage
C
Generators
D
Solar cells
4) The force that pushes electricity along wires is _______________.
A
generators.
B
solar cells.
C
electromagnets.
D
voltage.
5) Electricity sets up a magnetic field around ___________________.
A
electric cells.
B
electromagnets.
C
generators.
D
solar cells.
6) How does a battery create current?
A
Chemical energy changes into electrical energy.
B
Chemical energy changes into energy of motion.
C
Energy of motion changes into electrical energy.
D
Electrical energy changes into chemical energy.
7) Brownie is a volunteer at a recycling center. Her job is to separate steel cans from aluminum cans. What device might make her job easier?
A
current detector
B
electromagnet
C
generator
D
transfromer
8) Before Emily plugged in the cord of her study lamp, she noticed the insulation on the cord was worm out. What should she do?
A
Plug in the cord, since she'll only be using the lamp for a short time.
B
Not plug in the cord until it's repaired, or buy a new lamp.
C
Plug the cord into an outlet with a number of other cords plugged in it.
D
Be sure she hold the plug when pulling it from the outlet.
9) Which of the following comparisons can you use to best explain voltage?
A
a compass needle
B
water in a garden hose
C
lemon juice in a glass
D
fire in a fireplace
10) If a large electromagnet is used in a junk yard, what happens if the electromagnet is turned off?
A
It loses it's magnetism, attracting many materials.
B
It loses it's magnetism, dropping many materials.
C
It becomes magnetic, dropping many materials.
D
It becomes magnetic, attracting many materials.
*select an answer for all questions
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