WorksheetsUnderstanding Watts
Total questions: 21
Worksheet time: 13mins
Watts are a measure of _______.
Power
Energy
Voltage
Current
Fill in the blank: Watts are calculated using the formula Current (I) * ______ =(W).
Watts
Amperes
Volts
Ohms
Magnets attract objects made of ________ materials.
magnetic
plastic
wooden
glass
Permanent magnets are made of ______ materials such as steel.
magnetic
non-magnetic
conductive
insulating
What type of magnets can be made using conductive and magnetic materials?
Permanent magnets
Temporary magnets
Natural magnets
Artificial magnets
What are the parts of a magnet that exert the greatest force?
Poles
Center
Edges
Surface
Magnetic poles occur in pairs usually called ______ and ______.
A) east (E) and west (W)
B) north (N) and south (S)
C) up (U) and down (D)
According to the law of magnets, what happens when like poles are near each other?
A) They attract
B) They repel
C) They do nothing
What is a magnetic field?
A region around a magnetic material or a moving electric charge within which the force of magnetism acts.
A type of electric field that only occurs in conductors.
A field that is only present in the absence of electric charges.
A region where gravitational forces are stronger than magnetic forces.
All magnets are surrounded by what?
Magnetic field
Electric field
Gravitational field
Sound waves
In 1820, who noticed that a wire carrying an electric current caused a compass needle to deflect?
The effect of electric current on a compass needle as discovered by Hans Ørsted is that the needle:
remains stationary
aligns with the electric field
deflects perpendicular to the current
spins continuously
The discovery made by Orsted regarding magnetic fields and electric current is that:
electric current can create a magnetic field
magnetic fields can create electric current
electric current and magnetic fields are unrelated
electric current can destroy magnetic fields
Which of the following is not a use of electromagnets?
A) Motors
B) Sensors
C) Controlled Magnets
D) Baking
Electromagnets are used in which of the following?
Linear Actuators
Swimming
Cooking
Painting
Which of these is an application of electromagnets?
Motors
Gardening
Painting
Cooking
Electromagnets can cause movement by:
creating a magnetic field that interacts with other magnetic fields
generating heat that causes expansion
producing light that pushes objects
emitting sound waves that cause vibrations
How do you determine the direction of motion when a local magnetic field and a current's direction are perpendicular?
A) Use Fleming's Left Hand Rule
B) Use Fleming's Right Hand Rule
C) Use the Lorentz Left Hand Rule
D) Use the Lorentz Right Hand Rule
In 1821, who created an electromagnetic rotary device that gave the basis for electric motor technology? (Hint, a type of cage device that protects from EMP weapons was named after him)
Nikola Tesla
Thomas Edison
Michael Faraday
James Watt
What force allows us to create motion in motors?
Gravitational force
Lorentz force
Frictional force
Magnetic force
Explain how spinning the shaft backwards in a motor can create an electricity generator.
By reversing the flow of current in the motor's coils
By converting mechanical energy into electrical energy
By increasing the motor's speed
By reducing the motor's resistance
