Electronic NOCTI Review WCCTC Latest 2023 Graded A+ Permanent Magnets- Readily retain their magnetic field for a long period of time
Temporary Magnets- lose magnetism quickly
Two types of magnets- Metallic Magnets & Ceramic Magnets
Two Popular Classifications- Alcino & Cunife
Coulomb's Law- Lik...
electronic nocti review wcctc latest 2023 graded a
permanent magnets readily retain their magnetic field for a long period of time
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Electronic NOCTI Review WCCTC Latest 2023 Graded A+ Permanent Magnets - ✔✔Readily retain their magnetic field for a long period of time Temporary Magnets - ✔✔lose magnetism quickly Two types of magnets - ✔✔Metallic Magnets & Ceramic Magnets Two Popular Classifications - ✔✔Alcino & Cunife Coulomb's Law - ✔✔Like poles repel and unlike poles attract Flux Lines - ✔✔Lines of magnetic force that surround a magnet Four Basic Rules & Characteristics: ✔✔1. Flux lines have direction or polarity(N+S) 2. The lines o force always form complete loops 3. Flux lines cannot cross each other 4. Flux lines tend to fo rm the smallest possible loops; ex. unlike poles attract Left-hand Magnetic Field Rule: ✔✔• Thumb in direction of current flow • Fingers in direction of flux lines Electromagnetic Induction - ✔✔Action that causes electrons to flow conductor when it moves across a magnetic field The amount of EMF induced in a conductor is determined by 4 factors: ✔✔1. The strength of the magnetic field 2. The speed of the conductor with respect to the field 3. The angle at which the conductor cuts the field 4. The length o f the conductor in the field Farraday's Law - ✔✔the voltage induced in the conductor is directly proportional to the rate at which the conductor cuts the magnetic lines of force Lenz's Law - ✔✔this basic principle is used to determine the direction of an i nduced voltage or current. Based on the principle of conservation of energy. Resistance(R) - ✔✔opposition to current flow 3 factors that contribute to a substance's resistance: ✔✔A. Length - Resistance of a conductor is DIRECTLY proportional to it's length B. Cross -sectional Area - Resistance is INVERSELY proportional to cross -sectional area C. Temperature - • Positive Temp. Coe fficient - Resistance increases as temperature increases. Temperature decreases as resistance increases. • Negative Temp. Coefficient - Resistance decreases as temperature increases. (ex.carbon) • Zero or Constant Temp. Coefficient - Resistance does change at all with changes in temperature Thermistor - ✔✔special type of resistor that changes 3 Types of FIXED Resistors - ✔✔Wire -wound Resistors, Carbon -composition Resistors, & Deposited - film Resistors Types of VARIABLE Resistors - ✔✔Potentiometer(or a pot), Rh eostat, & Sliding Contact Resistor
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