Engineering Design
Devices that Transform
Electricity
Electromagnetism
Review
100
Constraints are limitations on the design, such as available funds, resources, or time. In which step of our design process do you identify constraints?
ASK
100
What device changes electricity into mechanical energy and is inside all motors?
an electromagnet
100
What is the measurement of the pushing power of a current?
volts
100
Electromagnetism is a relationship between what two forces?
A. gravity and nuclear energy B. magnetism and gravity C. static electricity and current electricity D. electricity and magnetism
D. electricity and magnetism
ELECTROMAGNETISM
100
What do we call a position to which we compare other locations?
A. reference point B. motion
C. acceleration D. velocity
A. reference point
200
!DOUBLE JEOPARDY! Two clicks if you get it right.
What word means the same as 'test model'?
What word means "produce an idea or way of solving a problem by holding a spontaneous discussion"?
brainstorm
200
What device changes electricity into mechanical energy?
an electric motor
If you want to build your own for a test grade, here's one model you could use:
200
Which of the following devices contains one or more electromagnets? 98-99
doorbell hairdryer & speakers MRI atom smasher
All of these devices contain electromagnets.
all of them
200
What is a coil of wire acting as a magnet when carrying electric current?
A. circuit B. solenoid C. electromagnet D. motor
B.
200
The combination of all pushes and pulls acting on an object?
A. motion B. mass C. net force D. velocity
C. net force
300
You test your prototype. It doesn't work well. What should you do next?
You should IMPROVE and redesign as needed.
300
Oersted moved his __ near his __ and noticed movement.
A. wire battery B. battery table
C. compass battery D. compass table
C. compass battery
300
If resistance (ohms) increases and voltage (volts) stays the same, what happens to current (amp)?
Current (amps) decreases.
300
Which is the explanation for the Aurora Borealis?
A. Electromagnetic pulses shoot from Earth's mantle into the atmosphere.
B. Earth's atmosphere reflects radiation in seas.
C. Charged particles enter Earth's upper atmosphere near the magnetic poles.
D. aliens man, looks like aliens to me
[Double click if you got it right!]
C. Charged particles enter Earth's upper atmosphere near the magnetic poles.
300
What is the measure of how much matter is in an object?
A. weight B. mass C. acceleration D. force
B. mass
400
When you tried your test model out and determined how well it worked, what step were you following?
Experiment
400
What device changes mechanical energy into electricity?
an electric generator
400
Electrons travel from __ to ___.
A. positive to negative B. negative to positive
C. metal to nonmetal
D. high resistance to low resistance
B. negative to positive
400
Which picture best shows the domains of a magnet?
D.
400
Use the needed equation to solve.
F = ma a = F/m m= F/a
A cheetah with a mass of 20 kg hits a gazelle with 200 Newtons of force. What was the acceleration of the cheetah?
[Remember your unit of measurement.]
10 m/s squared
500
Why do Engineers change only one thing at a time with their prototype?
If they modify one thing, they know if that thing improves the prototype.
500
What device transfers electricity from one circuit to another by changing voltage level.
a transformer
500
If you reverse the __, then the magnetic field around the wire moves in the opposite direction.
A. direction of the current B. amount of voltage (volts) C. amount of current (amps) D. compass needle
A. direction of the current
500
What occurs when a wire moving near a magnet gains an electric current?
induction
500
If you put two 9 volt (V) batteries in a drone with resistance of 3 Ohms (R), how much current (I) does it carry?
I = V/R
6 Amps
18 / 3 = 6
[18 because it's two 9 volt batteries.]