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Worksheetsbrushless motors
Total questions: 18
Worksheet time: 9mins
You can tell that an electric motor is brushless because it has...
1 wire attached to it.
2 wires attached to it.
3 wires attached to it.
No wires attached to it.
The image shown is of a...
Internal combustion motor
Turbine engine
Brushed DC motor
Brushless AC motor
The motor seen in the images is an example of...
A brushed DC motor.
A brushless AC motor.
A magnetic motor.
A broken motor.
A brushless motor is more efficient than a brushed motor because...
There is less energy lost inside the motor due to friction and heat.
There is less power used to spin the motor.
There is less noise created in spinning the motor.
This is an incorrect statement. Brushed motors are more efficient.
The part of an electric motor that doesn't spin is called the...
armature
commutator
stator
bearings
In an electric motor, a magnetic field is generated by...
North and South magnets.
Electrical current running in wires that are situated between North and South magnets.
Electrical current running through wires.
Magnets spinning around wires.
In the image shown, the dark grey shapes are called:
Brushes
Armatures
Commutators
Windings
In a brushed DC motor, the commutator rings...
are joined together
do not spin
are connected to the spinning armature
are insulated from the battery
In the supplied image, the light grey objects are called...
the armature
the brushes
the magnets
the commutator rings
How many wires connect to a brushless AC motor?
2
3
4
6
What is the electronic device that sits between the battery and the brushless motor?
Electronic speed controller
Electronic armature controller
3-phase controller
Receiver
Why might a current-carrying wire be placed between a magnetic field?
To increase the current from the interaction of magnetic fields
To increase the voltage from the interaction of magnetic fields
To produce a force from the interaction of magnetic fields
What does the thumb indicate in flemings left hand rule?
Force
Motion
Current
Magnetic field direction
What direction is the force/motion in the following diagram?
Perpendicular to the magnets
Downwards
Parallel and through the magnets
What angle must there be between a magnetic field and a conductor in order for the maximum force to be exerted?
180
45
90
270
Name the effect that causes a coil of current-carrying wire in an electric motor to move.
The electromagnetism effect
The magnetic effect
The motor effect
Which rule can be used to work out which way a coil of wire rotates in a motor?
Fleming's left-hand rule
Fleming's right-hand rule
How does a split ring commutator work?
Swaps the contact evert full turn, so that the left-hand and right-hand arms of the coil always experience a force in the same direction.
Swaps the contact evert half turn, so that the left-hand and right-hand arms of the coil do not experience a force in the same direction.
Swaps the contact evert half turn, so that the left-hand and right-hand arms of the coil always experience a force in the same direction.
