AN ELECTRIC MOTOR
An electric motor converts electrical energy(electric current) into mechanical energy(rotational motion)
It consist of a rectangular coil of wire which can rotate freely between the poles of a permanent magnet
Electric current is supplied to the coil via a copper split ring commutator and two carbon brushes
An electric motor converts electrical energy(electric current) into mechanical energy(rotational motion)
It consist of a rectangular coil of wire which can rotate freely between the poles of a permanent magnet
Electric current is supplied to the coil via a copper split ring commutator and two carbon brushes
ELECTROMAGNET
An electromagnet is made by winding wire coils in opposite directions around the two arms of a U-shape soft iron bar
An electromagnet is made by winding wire coils in opposite directions around the two arms of a U-shape soft iron bar
When current flows through the wire the ends of the soft iron become poles of a magnet: one a N-pole and the other a S-pole
The magnetism lasts as long as the current flows
The strength of the magnet increases if:
1. The number of turns around each of the U-bar is increased
2. The current is increased, and
3. the poles are made closer
Electromagnets are used for lifting magnetic materials, and in appliances such as electric bells and relays
The magnetism lasts as long as the current flows
The strength of the magnet increases if:
1. The number of turns around each of the U-bar is increased
2. The current is increased, and
3. the poles are made closer
Electromagnets are used for lifting magnetic materials, and in appliances such as electric bells and relays
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The magnetism lasts as long as the current flow.
THE MOVING COIL GALVANOMETER
A galvanometer: is an instrument used for measuring small current(in the milliampere range)
THE AMMETER
An ammeter is an instrument used to measure large electric current of the order of ampere
It is connected in series with the part of the circuit where the current if to be measured
It must have very low resistance
A galvanometer: is an instrument used for measuring small current(in the milliampere range)
THE AMMETER
An ammeter is an instrument used to measure large electric current of the order of ampere
It is connected in series with the part of the circuit where the current if to be measured
It must have very low resistance
💥 Electromagnetism
This is a phenomenon which takes place due to the interaction of both magnetic field and the electric field.
Hence, electromagnetic field is the joint interaction of electric field and magnetic field.
💥Force in an electromagnetic field
As discussed earlier that electromagnetic field is a combination of both electric and magnetic field.
Electric force = qE
q is the quantity of charge in Coulomb
E is the electric field intensity in N/C
Magnetic force = qvB
v is the velocity, B is the magnetic field strength measured in Tesla.
Thus
Electromagnetic force = q(E + vB)
This is a phenomenon which takes place due to the interaction of both magnetic field and the electric field.
Hence, electromagnetic field is the joint interaction of electric field and magnetic field.
💥Force in an electromagnetic field
As discussed earlier that electromagnetic field is a combination of both electric and magnetic field.
Electric force = qE
q is the quantity of charge in Coulomb
E is the electric field intensity in N/C
Magnetic force = qvB
v is the velocity, B is the magnetic field strength measured in Tesla.
Thus
Electromagnetic force = q(E + vB)
👍2
A magnet is similar to a bipolar charged system in that
A. It consists of two opposite poles - the north and south poles
B. The earth's magnetic field has a south pole near the geographical north pole and a north pole near the geographical south pole
C. The force of attraction and repulsion between opposite and between like poles obeys a law for electrostatic charges
D. A and B only
E. A and C only
A. It consists of two opposite poles - the north and south poles
B. The earth's magnetic field has a south pole near the geographical north pole and a north pole near the geographical south pole
C. The force of attraction and repulsion between opposite and between like poles obeys a law for electrostatic charges
D. A and B only
E. A and C only
Which of the following elements are real magnetic materials?
A. Iron, steel and nickel
B. Copper, steel and iron
C. Lead, iron and brass
D. Glass, lead and steel
E. Stone, air and iron
A. Iron, steel and nickel
B. Copper, steel and iron
C. Lead, iron and brass
D. Glass, lead and steel
E. Stone, air and iron
Which of the following methods CANNOT be used to produce a steel magnet? The
A. Passing of an electric current through a solenoid
B. Repeated stroking of the specimen with a magnet
C. Repeated stroking of the specimen in opposite directions with magnets
D. Heating of the specimen
E. Hammering of the specimen in the earth's magnetic field
A. Passing of an electric current through a solenoid
B. Repeated stroking of the specimen with a magnet
C. Repeated stroking of the specimen in opposite directions with magnets
D. Heating of the specimen
E. Hammering of the specimen in the earth's magnetic field
❤8
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That in 2023 DT awarded ₦50,000 to the best 4 students. 😁😁🔥🔥
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You 🫵🫵 can be one of our winners this year.
Checkout our 2024 UTME prizes below:
350+ scorers - ₦50,000
340+ scorers - ₦25,000
330+ scorers - ₦15,000
Free one month intensive post UTME boot camp for 300+ scorers.
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Mock has started. Enjoy!!
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Quiz key: oI6JxW1smB
DT UTME MOCK (Maths, chem, phy, and English)
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Check what femi said about the ongoing intensive tutorial, By God's grace coupled with our intensive training, He will definitely ace this year JAMB
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*DT(RC-6943733) presents 2024 LAP CLASS ( Look And Pick the correct answers).*
*Date- April 1st to 19th*
*Maximize Your JAMB Exam Score with DT’s LAP Class get The Ultimate Revision Experience for Outstanding Success*
• *Features*
- 6hrs lecture daily( within 3pm to 12am)
- 10 hours+ DSC(Daily study challenge and brainstorming)
- Access to past lectures and mocks worth over #20, 000
- Daily synonyms, Antonyms, idioms, summary notes
- Over #100,000 cash prize is available to be won
- Treating at least 200 UTME questions daily
- Revising the entire UTME syllabus
- At least 6 standard mock with prizes available to be won
- Access to 100+ JAMB recommended texts and past questions
- Tricks and shortcuts to score 320+ with ease
- Follow up, guidance and mentorship
- And lots more....
Venue- WhatsApp/Telegram
Price- new students 5k
Feb. /March students- 4k
To join message https://wa.me/2348132431422?text=Hi+DT+secretary,+my+name+is---%2C+I%27m+interested+in+DT%27s+LAP+Class
📒Metals Introduction
📌metals with a few exceptions have high boiling point and melting point they have relatively high densities and are good conductors of heat and electricity they are shiny malleable ductile and have high tensile strength
📌Questions
What does
Mallability, ductility, sonorous and lustre nature of metals
Drop ur ideas👇👇
📌metals with a few exceptions have high boiling point and melting point they have relatively high densities and are good conductors of heat and electricity they are shiny malleable ductile and have high tensile strength
📌Questions
What does
Mallability, ductility, sonorous and lustre nature of metals
Drop ur ideas👇👇
👍3
📍metals tend to ionize by-election loss to form positive ions why nom metals tend to ionize by accepting electrons to form negative ions
📍most oxide of metals are basic why does of non-metals are acidic or neutral
📍metals which are more electropositive than hydrogen displaced it from acid
🛑metals are found in combining form as mineral
🛑Ore contain minerals and earthy impurities the reactive metals are extracted from their ore by electrolytic reduction the less reactive metals are extracted by chemical and thermal reduction of their ores
📍most oxide of metals are basic why does of non-metals are acidic or neutral
📍metals which are more electropositive than hydrogen displaced it from acid
🛑metals are found in combining form as mineral
🛑Ore contain minerals and earthy impurities the reactive metals are extracted from their ore by electrolytic reduction the less reactive metals are extracted by chemical and thermal reduction of their ores
👍5
This are the common characteristics of all metals📌
🔗 concentration of ore
Ore may be concentrated by one of these ways
📍washing away of the earthly materials in a stream of water to leave behind the heavier ore as in the case of tin ore
📍 Froth flotation as in the case of zinc
📍By passing ore which are magnetic e.g copper ore through a magnetic separator
📌 Roasting of ore in air is usually done in order to change it to an oxide , ores which are oxide are easy to deal with during metal extraction
Ore may be concentrated by one of these ways
📍washing away of the earthly materials in a stream of water to leave behind the heavier ore as in the case of tin ore
📍 Froth flotation as in the case of zinc
📍By passing ore which are magnetic e.g copper ore through a magnetic separator
📌 Roasting of ore in air is usually done in order to change it to an oxide , ores which are oxide are easy to deal with during metal extraction