General
What are the two poles of a magnetic field
North and South
What can the hand rules be used to indicate
To find out the motion of the current and the magnetic field
What is the closest object to an electric motor?
Tip: This device does not convert electrical energy into kinetic energy.
A speaker
What is a transformer?
A transformer is an electrical device that acn be used to increase or decrease the voltage of an altrenating current.
Define electromagnetic induction
Using a magnetic field to produce current
Two properties of Electromagnetic Waves
Transverse
Same speed in vacuum
Index : Field
Middle : Current
Thumb : Movement
Name two types of loss of an electric motor.
Any 2: Heat, Sound, mechanical loss, magnetic loss, iron core loss, copper loss.
What is the direction of the force when you pull up
Downwards
Two uses for infrared or Ultraviolet
Infrared: controller, fiber optics, thermal imaging, night vision, heating, motion sensor
Ultraviolet: security marking, fluorescent bulb, getting a suntan
State all the functions of Fleming's right hand rule
Index : Field
Middle : Current
Thumb : Movement
Name four devices that you can find an electric motor
Fan, food blender, toy car, CD player (Any Logical answer)
Why is it crucial that the coil wires of a transformers are insulated?
To prevent the flow of current from the primary to the secondary coil.
Magnetic field left, current inwards, what is the direction of force
Upwards
Name all 7 types of waves in the electromagnetic spectrum from the lowest to highest.
Rediowaves, microwaves, infrared, visible light, ultraviolet, X ray, gamma rays
The current is going from top to bottom. Describe the magnetic field.
Clockwise
Differentiate electric motor and generator
Electric motor turns electrical energy into kinetic energy, generator turns kinetic energy into electrical energy
Force downwards, magnetic field left where current
Outwards
Explain the dangers of X-rays and how it would harm someone
X rays, and Gamma rays, are ionising so they can kill living cells or mutating them, causing cancer
Name and describe all the 4 hand rules
Fleming's right hand rule
Fleming's left hand rule
Right hand rule for solenoid
Right hand rule for magnetic filed in a wire
Which of the following is a legitimate type of electric motor?
A. BC motor
B. Rotor motor
C. Stepper motor
D. Alternator
C
When the alternating current is flowing through the primary coil, an alternating voltage is induced in the secondary coil. Explain why this occurs.
The alternating current in the primary coil creates an alternating magnetic field (1) in the iron core (1), which lines pass through the secondary coil (1) and induce an alternating voltage in it. (1)
Force upwards, current outwards, direction of magnetic field
Left