Electricity and magnetism
When it comes to electric charge, forces are been exerted on one another. Charges can either repel each other (like or same charges) or attract each other. Note that static electricity can be created if two object rubbed against each other like in the case of a balloon and a rug. This happen as a result of electrons been temporarily pulled away from atoms.
Terms in electricity
- Electric current is the movement of charged particles which consists of electrons.
- Conductors are medium or materials that allows electrons to flow quickly from one atom to another
- Insulators does not allow electrons to move freely
- Semiconductors are meduim or materials that controls the in flow of electrons they act as an insulator and conductor as the same time.
Note that direct current flows in one direction and are power by battery. Alternating current are used in household. It moves to and fro within the meduim or materials used.
An electric current produces a magnetic fields which attract magnetic substance. When it comes to Electromagnetic, the charged particles flows along a coil of wire which is being powered by battery. In permanent magnet, every magnet has the north and south Pole at each ends. The north and south Pole attract each other while the same pole repel each other.
Application bof electromagnetic field in the following:
When it comes to an electric motor, the magnetic field are produce by electric current. The magnetic fields push against one another, turning the shaft of the motor. In a generator a moving magnet create electric current while in a transformer; here an incoming electric current, in coiled wire produces unstable magnetic fields. Thus, producing an electric current flowing in different voltage.
Questions
1. Static electricity occurs when ………
A. Electrons are been temporarily pulled away
B. Electrons are permanently pulled away
C. Atoms are rubbed
D. Atoms repel each other
Ans= A
2. …….. is the movement of charged particles which consists of electrons. A. Electric charge B. Electricity C. Conductors D. Electric charge
Ans= A
3. Which of the following are examples of conductors?
A. Plastic
B. Iron
C. Paper
D. Pipe
Ans= B
4. Conductors, insulators and semiconductors are ……..
A. Meduim
B. Concepts
C. Dialogue
D. Devices
Ans= A
5. …….. produce magnetic field
A. Insulators
B. Battery
C. Generator
D. Electric charge
Ans= D