Physics 5054 · O Level
The d.c. motor
15 practice questions on The d.c. motor, with worked solutions and instant marking.
A split-ring commutator is fitted in a simple d.c. motor. It changes the direction of the current in the coil. How many times does it reverse the current?
May/June 2016
The diagram shows a basic d.c. motor. The switch is switched on and the coil turns. Which change causes the coil to turn in the opposite direction and at a higher rate?
May/June 2016
What effect does a split-ring commutator have?
May/June 2017
Fig. 7.1 shows a section of a d.c. electric motor.
May/June 2017
In a simple motor, the coil is placed between the poles of a permanent magnet. If a current flows through the coil, it turns about its axis. What would reduce the frequency of rotation of the coil?
May/June 2019
Fig. 7.1 shows part of a simple d.c. electric motor. The motor is linked to a battery, and the battery's positive terminal is connected to terminal A.
May/June 2021
Fig. 5.1 depicts a basic d.c. motor fitted in a toy car.
May/June 2022
The diagram depicts a simple d.c. motor. What is the component marked Q?
May/June 2024
Students are required to propose factors that influence the rotational speed of a direct current (d.c.) motor. Three suggestions are given below. 1 the strength of the magnetic field 2 the current 3 the number of turns on the coil Which of these suggestions are correct?
May/June 2025
Fig. 7.1 depicts a basic d.c. motor. The poles at the ends of the magnets have not been labelled.
May/June 2025
The diagram illustrates a simple d.c. motor. What is the component marked Q?
Oct/Nov 2015
Which device is used to change electrical energy into kinetic energy?
Oct/Nov 2022
In a d.c. motor, the coil is linked to a commutator. As the commutator turns, it joins the coil to the power supply. After each half-turn, the current in the coil reverses. What is the commutator called, and what is the orientation of the plane of the coil at the moment the current reverses?
Oct/Nov 2023
What component of a simple d.c. motor reverses the current direction in the coil after each half-turn of the coil?
Oct/Nov 2024
Which part is not required for a simple d.c. motor to operate?
Oct/Nov 2025