Exploring the Mechanics of DC Motors

What completes an electrical circuit allowing the current to flow?

• A transistor

• A capacitor

• A closed path

• A resistor

What happens when opposite poles of two magnets are brought close to each other?

• They demagnetize

• Nothing happens

• They repel

• They attract

What is the main characteristic of a permanent magnet?

• It can be turned off

• It is always magnetized

• It only attracts metal

• It can be easily demagnetized

What does reversing the battery's polarity in an electromagnet do?

• None of the above

• Stops the current

• Reverses the poles

• Decreases its strength

What is the role of the brushes in an electric motor?

• To clean the commutator

• To maintain electrical contact with the commutator

• To insulate the motor components

• To cool down the motor

What is the function of the armature in an electric motor?

• To control the speed

• To support the motor structure

• To generate electricity

• To provide rotational motion

What is the purpose of a commutator in an electric motor?

• To automatically reverse current direction

• To reduce friction

• To store electricity

• To increase current flow

How can the torque of an electric motor be increased?

• By using more wires

• By using thinner wires

• By decreasing the current

• By using fewer wires

What does the stator in an electric motor do?

• Holds the armature in place

• Does not move and supports the rotor

• Transfers electricity to the rotor

• Moves and generates torque

What type of motor is typically found in battery-powered devices?

• Universal motor

• AC motor

• DC motor

• Stepper motor